Secure Cross Chain Bridge Simulation In Blockchain — Complete Documentation & Simulation

Overview & System Context

Secure Cross Chain Bridge Simulation In Blockchain: Comprehensive Web-Sourced Technical Investigation Exhaustive Research Dossier · Pure Web-Scraped Content: ~9017 Words · Real Software Screenshots: 3 1. Executive Overview & Technical Background This is a list of free and open-source software (FOSS) packages, computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition may be more appropriately called free software; the GNU project in particular objects to their works being referred to as open-source. For more information about the philosophical background for open-source software, see free software movement and Open Source Initiative. However, nearly all software meeting the Free Software Definition also meets the Open Source Definition and vice versa. A small fraction of the software that meets either definition is listed here. Some of the open-source applications are also the basis of commercial products, shown in the List of commercial open-source applications and services.

Cline – AI coding agent for IDEs and the command line. Codex CLI – AI coding agent and command-line interface developed by OpenAI. Command Code — CLI and desktop AI agent DeepSeek Coder – large language model designed for code generation and AI-assisted software development. Eclipse Theia – integrated development environment and framework with AI-assisted software development features. goose – AI coding agent for the desktop and command line. Kilo Code — CLI and IDE extension developed by Anaconda OpenCode — CLI, desktop app, web app, and IDE extensions OpenHands — AI software development agent Oh My Pi – terminal-based AI coding agent developed as a fork of Pi. Pi – terminal-based AI coding agent. Zed – source-code editor with integrated AI-assisted development and agentic coding features.

Apertus – Swiss National AI Initiative LLM BERT – Google LLM BLOOM – BigScience multilingual LLM Cerebras-GPT – Cerebras Systems LLMs DeepSeek – R1 and V3 models Gemma 4 – Google LLM GLM-4.5 and later versions – Z.ai LLMs GPT-1, GPT-2, and GPT-OSS – OpenAI LLMs GPT-J, GPT-Neo, and GPT-NeoX – EleutherAI LLMs Hy – Tencent open-weight LLM Granite – IBM LLMs Grok-1 – xAI LLM Inkling – Thinking Machines Kimi (some versions) – Moonshot AI LLMs MiMo (some versions) – Xiaomi LLMs Mistral (some versions) Muse Glimmer — Meta Superintelligence Labs LLM Nemotron 3 – Nvidia open-weight models OLMo – Allen Institute for AI LLM Phi – Microsoft LLMs Qwen (some versions) – Alibaba Cloud LLMs Sarvam-M, Sarvam-105B and Sarvam-30B – Sarvam AI LLMs SmolLM – Hugging Face small language models (SLMs) Step-3.7Flash – StepFun LLM T5 – Google LLM XLNet – Google LLM ArduPilot CoppeliaSim Gazebo Mobile Robot Programming Toolkit OpenRTM-aist Paparazzi Project Player Project Python Robotics Robot Operating System (ROS) TurtleBot UBtech Thinker Webots – robot simulator Figure 1: Best Cross-Chain Bridges in Crypto - DailyCoin Archimedes (CAD) Art of Illusion Blender BRL-CAD – constructive solid geometry (CSG) solid modeling computer-aided design (CAD) system FreeCAD – parametric 3D CAD modeler with a focus on mechanical engineering, BIM, and product design LeoCAD — beginner Lego 3D modeler LibreCAD – 2D CAD software using AutoCAD-like interface and file format MakeHuman MeshLab Open Cascade Technology (OCCT) – CAD kernel for 3D CAD, CAM, CAE OpenSCAD – scripting-based 3D CAD software QCAD SolveSpace – 2D and 3D CAD, constraint-based parametric modeler with simple mechanical simulation abilities Sweet Home 3D Wings 3D Electric FreePCB Fritzing – CAD software for the design of electronics hardware to build more permanent circuits from prototypes gEDA GNU Circuit Analysis Package (Gnucap) Icarus Verilog KiCad – suite for electronic design automation (EDA) for schematic capture, PCB layout, manufacturing file viewing, SPICE simulation, and engineering calculation KTechLab Magic Ngspice pcb-rnd Oregano Quite Universal Circuit Simulator (QUCS) Verilator XCircuit Blender – 3D computer graphics software toolset used for creating animated films, visual effects, art, 3D printed models, and motion graphics FreeCAD – equivalent of Blender geared toward mechanical engineers OpenFOAM – software used for computational fluid dynamics (or CFD) FlightGear – atmospheric and orbital flight simulator with a flight dynamics engine (JSBSim) that was used in a 2015 NASA benchmark to judge new simulation code to space industry standards SimPy – queue-theoretic event-based simulator written in Python Salome – generic platform for Pre- and Post-Processing for numerical simulation OpenPGP – open-source version of Pretty Good Privacy GNU Privacy Guard – replacement for PGP OpenSSL – library for applications that provide secure communications over computer networks NaCl (software) – crypto library Libsodium – fork of NaCl VeraCrypt – disk encryption software forked from TrueCrypt LUKS – standard for disk encryption on Linux systems Nym (mixnet) – mix network that uses noise and random packet timing for obfsucation, overlay network for NymVPN Tor (network) – free overlay network for enabling anonymous communication Tails (operating system) – security-focused Linux distro using Tor by default Signal (software) – secure messaging app Off-the-Record Messaging – protocol for secure instant messaging GPGTools – macOS suite for GnuPG-based encryption Figure 2: Best Cross-Chain Bridges in Crypto - DailyCoin Aircrack-ng – Wi-Fi security auditing tool BackTrack – predecessor to Kali Linux Burp Suite Community Edition – security assessment and penetration testing of web applications Ghidra – software reverse engineering suite developed by the NSA Hashcat – password recovery utility High Orbit Ion Cannon – DDoS hping3 — packet crafting and network penetration-testing utility Hydra (software) – login cracker supporting numerous protocols John the Ripper – password cracking tool Kali Linux – penetration testing Linux distribution Metasploit Project – framework for developing and executing exploit code Netcat – network utility for reading/writing data across networks Nikto (vulnerability scanner) – web server vulnerability scanner Nmap – network scanning, port scanner, and auditing tool OpenSSH – implementation of the SSH protocol Radare2 – reverse engineering framework Snort (software) – network intrusion detection system sqlmap – automated SQL injection and database takeover tool Suricata (software) – network threat detection engine Volatility (memory forensics) – memory forensics framework for incident response Wireshark – network protocol analyzer YARA – tool to identify and classify malware qBittorrent – BitTorrent client Transmission (BitTorrent client) – lightweight BitTorrent client IPFS – InterPlanetary File System for decentralized storage and sharing RetroShare – secure communication platform with file sharing Zerocoin – privacy-focused cryptocurrency protocol Zcash – cryptocurrency based on Zerocoin using zk-SNARKs Monero – privacy-focused cryptocurrency using ring signatures NYM — Nym mixnet privacy- and security-focused token Tornado Cash — Cryptocurrency tumbler 2. System Architecture & Core Working Principles ClamAV – cross-platform antimalware toolkit written in C and C++, able to detect many types of malware including viruses ClamWin – antivirus tool for Windows and written in C, C++ Lynis – security audit tool (set of shell scripts) for Unix and Linux Bouncy Castle GnuPG GnuTLS KGPG NaCl OpenSSL Seahorse Signal stunnel TextSecure wolfCrypt 7-Zip Snort – network intrusion detection system (IDS) and intrusion prevention system (IPS) Suricata – network threat detection engine OpenVAS – software framework of several services and tools offering vulnerability scanning and vulnerability management Nmap – network scanner, port scanner, and security auditing tool Nikto – web server vulnerability scanner Volatility – memory forensics framework for incident response Cyberduck – macOS and Windows client (since version 4.0) Lsh – server and client, with support for SRP and Kerberos authentication OpenSSH – client and server PuTTY – client-only Figure 3: Cross-Chain Bridge Tracing Demystified Apache Cassandra – NoSQL database from Apache Software Foundation offers support for clusters spanning multiple datacenter Apache CouchDB – NoSQL database from Apache Software Foundation with multi-master replication MariaDB – community-developed relational database management system with pluggable storage engines and commercial support PostGIS – adds support for geographic objects to the PostgreSQL as per Open Geospatial Consortium (OGC) PostgreSQL – relational database management system emphasizes on extensibility and SQL compliance and available for Windows, Linux, FreeBSD, and OpenBSD ATutor – web-based Learning Content Management System (LCMS) Canvas LMS – web-based, open, extensible learning management system Chamilo – web-based e-learning and content management system Claroline – collaborative Learning Management System DoceboLMS – SAAS/cloud platform for learning eFront – icon-based learning management system H5P – framework for creating and sharing interactive HTML5 content IUP Portfolio – educational platform for Swedish schools ILIAS – web-based learning management system (LMS) Moodle – learning management system OLAT – web-based Learning Content Management System Omeka – content management system for online digital collections Sakai Project – web-based learning management system SWAD – web-based learning management system Kiwix – offline web browser that allows users to download Wikipedia's entire content and use it for offline learning. Later it was expanded with repositories for Wikimedia Foundation, public domain texts from Project Gutenberg, many of the Stack Exchange sites, and other resources OpenStreetMap – OpenStreetMap was developed in 2004. It uses Open data and users data input through Crowdsourcing and Web mapping to create a complete and downloadable alternative to other online maps.

This allow users to enter data when there is no data available due to lack of governance and economic interest or due to lower population of the places mapped Advanced Simulation Library ASCEND Calcpad Calculix CHEMKIN – chemical kinetics COCO simulator – chemical process simulator CP2K – quantum chemistry and solid-state physics DWSIM – chemical process simulator General Mission Analysis Tool (GMAT) – space mission analysis GNU Octave – numerical-analysis GROMACS – simulations of proteins, lipids, and nucleic acids JSBSim – flight dynamics engine LAMMPS – Molecular dynamics Open Babel – chemical informatics OpenModelica – chemical process simulator OpenSees – earthquake engineering OpenVSP – parametric aircraft geometry tool Pyomo – mathematical optimization QBlade – wind turbine design and aerodynamic simulation software REFPROP – reference Fluid Thermodynamic and Transport Properties XFOIL – analysis of subsonic isolated airfoils .apng – Animated Portable Network Graphics .avif – AV1 Image File Format .bpg – Better Portable Graphics .exr – OpenEXR .fits – Flexible Image Transport System primarily for Astronomy .flif – Free Lossless Image Format .gif – Graphics Interchange Format .iff / .lbm – InterLeaved BitMap .jng – JPEG Network Graphics .jpg or .jpeg – Joint Photographic Experts Group .jxl – JPEG XL .mng – Multiple-image Network Graphics .miff / .mi – Magick Image File Format .pam, .pbm, .pgm, .ppm, .pnm – Netpbm file formats .pgf – Progressive Graphics File .png – Portable Network Graphics .qoi – Quite OK Image Format .tiff – Tag Image File Format .wbmp – Wireless Application Protocol Bitmap Format .webp .xbm – X BitMap .xcf – GIMP .xpm – X PixMap .adoc – AsciiDoc .epub – ebook format .latex – LaTeX, macro package built on top of TeX for simplification .md – Markdown .odt – OpenDocument .rtf – Rich Text Format .tex – high-quality typography for mathematical notation, physics, chemistry, engineering/scientific notation .texinfo 1DayLater – invoicing software GnuCash – double-entry book-keeping HomeBank – personal accounting software KMyMoney – double-entry book-keeping LedgerSMB – double-entry book-keeping RCA open-source application – management accounting application SQL-Ledger – double-entry book-keeping TurboCASH – double-entry book-keeping for Windows 3. Software Implementation, Frameworks & Protocols Bitcoin – blockchain platform, peer-to-peer decentralised digital currency Ethereum – blockchain platform with smart contract functionality CiviCRM – Constituent Relationship Management software aimed at charities and NGOs iDempiere – business Suite, ERP and CRM SuiteCRM – web-based CRM Adempiere – Enterprise resource planning (ERP) business suite Apache OFBiz – suite of enterprise applications from Apache Software Foundation Compiere – ERP solution automates accounting, supply chain, inventory, and sales orders Dolibarr – web-based ERP system ERPNext – web-based ERP system for managing accounting and finance ERP5 – Single Unified Business Model based system written with Python and Zope iDempiere – fully navigable on PCs, tablets and smartphones driven only by a community of supporters JFire – ERP business suite written with Java and JDO LedgerSMB – double entry accounting and ERP system written with Perl metasfresh – ERP Software Odoo – ERP, CRM and CMS Openbravo – web-based ERP Tryton – ERP MAME – multi-platform emulator for arcade game systems Mednafen – multi-platform emulator MESS – multi-platform emulator RetroArch – cross-platform front-end for emulators, game engines and video games Snes9x – Super Nintendo emulator Stella – Atari 2600 emulator PCSX – PlayStation emulator PCSX2 – PlayStation 2 emulator PPSSPP – PlayStation Portable emulator Project64 – Nintendo 64 emulator RPCS3 – PlayStation 3 emulator Dolphin (emulator) – GameCube and Wii emulator Citra (emulator) – Nintendo 3DS and Wii emulator Cemu – Wii U emulator TIC-80 – virtual machine game engine that mimics the 8-bit systems of the 1980s QGIS – cross-platform desktop geographic information system (GIS) application to view, edit, and analyse geospatial data ADMB Euler Math Toolbox FreeMat GNU Data Language GNU MCSim GNU Octave J Julia Owl Scientific Computing Perl Data Language S-Lang Scilab Yorick Blender Game Engine – discontinued 2019 Godot – application for the design of cross-platform video games MonoGame – C# framework Open3DEngine – based on Amazon Lumberyard Stride – (prev. Xenko) 2D and 3D cross-platform game engine originally developed by Silicon Studio Amavis – email content filter Claws Mail – email Client Fetchmail – email Retrieval Geary – email client based on WebKitGTK+ GNUMail – cross-platform email client Hula – discontinued mail and calendar project K-9 Mail – Android Email Client MailScanner – email security system MH Message Handling System – email Client Modest – email Client Mozilla Mail & Newsgroups – email Client that was part of the now discontinued Mozilla Application Suite Mozilla Thunderbird – email, news, RSS, and chat client POPFile – cross-platform mail filter Proton Mail – app and web-based end-to-end encrypted e-mail evolved to become FOSS Roundcube – web-based IMAP email client Sylpheed – email and News Client Sympa – MLA software I2P – anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication OnionShare – file sharing app using Tor network Popcorn Time – multi-platform media player qBittorrent – BitTorrent client Transmission – BitTorrent client Deluge – BitTorrent client BSD – FreeBSD, OpenBSD, NetBSD, GhostBSD, TrueNAS, MidnightBSD, DragonFly BSD, OPNsense, pfSense, XigmaNAS, among others. GrapheneOS – Privacy- and security-focused, Android-based mobile operating system Kali NetHunter Linux – Debian, Ubuntu, Manjaro, Fedora, openSUSE, antiX, NixOS, Kali, Alpine, Tails, Mageia, Slackware, Gentoo, BlackArch, among others (List of Linux distributions). LineageOS – Android-based operative system for tablets and mobile phones GNU Hurd Mobian Nura Plasma Mobile PureOS Ubuntu Touch Redox OS FreeDOS – OS compatible with IBM PC DOS and Microsoft's MS-DOS ReactOS – OS intended to run the same software as Windows, originally designed to simulate Windows NT 4.0, later aiming at Windows 7 compatibility. It has been in the development stage since 1996.

AppleWin DOSBox – DOS programs emulator (including PC games) GNOME Boxes Hercules (emulator) Kernel-based Virtual Machine (KVM) QEMU VirtualBox – hosted hypervisor for x86 virtualization 4. Practical Deployment, Analysis & Case Studies DTrace – dynamic tracing framework for analyzing and troubleshooting running applications and operating systems Memtest86 – stress-tests RAM on x86 machines strace – diagnostic utility for tracing system calls and signals Valgrind – debugging and profiling tool for detecting memory and threading errors Xnee – record and replay tests Acceleo – model-to-text code generator Apache Velocity – Java-based template engine used for code generation Babel – JavaScript transcompiler Bison CodeSynthesis XSD – XML Data Binding compiler for C++ CodeSynthesis XSD/e – validating XML parser/serializer and C++ XML Data Binding generator for mobile and embedded systems Flex lexical analyser – generates lexical analyzers Open Scene Graph – 3D graphics application programming interface OpenSCDP – Open Smart Card Development Platform SableCC – parser generator for Java and .NET SWIG – Simplified Wrapper and Interface Generator for several languages Umple – modeling and programming language with source code generation xmlbeansxx – XML Data Binding code generator for C++ YAKINDU Statechart Tools – Statechart code generator for C++ and Java Apache Flink – stream and batch data processing framework Apache Hadoop – distributed storage and processing framework Apache Mahout – scalable machine learning library Apache Spark – unified analytics engine Dask – parallel computing for analytics in Python ELKI – data analysis algorithms library GNU Octave – numerical computing environment JASP – GUI program for data analytics, data science, and machine learning Jupyter Notebook – interactive computing Keras – neural network library KNIME – data analytics platform Matplotlib – data visualization library MLlib – machine learning library for Apache Spark NumPy – numerical computing library Orange – data mining tool pandas – data manipulation library PyTorch – machine learning and deep learning framework Python R – statistical computing language SageMath – mathematics and data analysis environment SciPy – scientific computing library scikit-learn – Python machine learning library TensorFlow – machine learning framework WEKA – machine learning and data analysis suite 3G Bridge – grid interoperability Advanced Resource Connector – middleware BOINC – volunteer computing HTCondor – high-throughput computing Simple Grid Protocol – grid computing UNICORE – middleware CP2K – atomistic and molecular simulation of solid-state, liquid, molecular, and biological systems Open-source software Open-source license Comparison of file synchronization software § Open-source GNOME Core Applications List of concept- and mind-mapping software § Free and open-source List of formerly proprietary software List of GNU packages List of HDL simulators § Free and open-source simulators List of KDE applications List of open-source hardware projects List of optimization software § Free and open-source software List of public domain projects List of spreadsheet software § Free and open-source software List of Unix commands The history of video games began in the 1950s and 1960s as computer scientists began designing simple games and simulations on minicomputers and mainframes. Spacewar! was developed by Massachusetts Institute of Technology (MIT) student hobbyists in 1962 as one of the first such games on a video display. The first consumer video game hardware was released in the early 1970s. The first home video game console was the Magnavox Odyssey, and the first arcade video games were Computer Space and Pong. After its home console conversions, numerous companies sprang up to capture Pong's success in both the arcade and the home by cloning the game, causing a series of boom and bust cycles due to oversaturation and lack of innovation. By the mid-1970s, low-cost programmable microprocessors replaced the discrete transistor–transistor logic circuitry of early hardware, and the first ROM cartridge-based home consoles arrived, including the Atari Video Computer System (VCS). Coupled with rapid growth in the golden age of arcade video games, including Space Invaders and Pac-Man, the home console market also flourished. The 1983 video game crash in the United States was characterized by a flood of too many games, often of poor or cloned qualities, and the sector saw competition from inexpensive personal computers and new types of games being developed for them. The crash prompted Japan's video game industry to take leadership of the market, which had only suffered minor impacts from the crash. Nintendo released its Nintendo Entertainment System in the United States in 1985, helping to rebound the failing video games sector. The latter part of the 1980s and early 1990s included video games driven by improvements and standardization in personal computers and the console war competition between Nintendo and Sega as they fought for market share in the United States. The first major handheld video game consoles appeared in the 1990s, led by Nintendo's Game Boy platform. In the early 1990s, advancements in microprocessor technology gave rise to real-time 3D polygonal graphic rendering in game consoles, as well as in PCs by way of graphics cards. Optical media via CD-ROMs began to be incorporated into personal computers and consoles, including Sony's fledgling PlayStation console line, pushing Sega out of the console hardware market while diminishing Nintendo's role. By the late 1990s, the Internet also gained widespread consumer use, and video games began incorporating online elements. Microsoft entered the console hardware market in the early 2000s with its Xbox line, fearing that Sony's PlayStation, positioned as a game console and entertainment device, would displace personal computers. While Sony and Microsoft continued to develop hardware for comparable top-end console features, Nintendo opted to focus on innovative gameplay. Nintendo developed the Wii with motion-sensing controls, which helped to draw in non-traditional players and helped to resecure Nintendo's position in the industry; Nintendo followed this same model in the release of the Nintendo Switch. From the 2000s and into the 2010s, the industry has seen a shift of demographics as mobile gaming on smartphones and tablets displaced handheld consoles, and casual gaming became an increasingly larger sector of the market, as well as a growth in the number of players from China and other areas not traditionally tied to the industry. To take advantage of these shifts, traditional revenue models were supplanted with ongoing revenue stream models such as free-to-play, freemium, and subscription-based games. As triple-A video game production became more costly and risk-averse, opportunities for more experimental and innovative independent game development grew over the 2000s and 2010s, aided by the popularity of mobile and casual gaming and the ease of digital distribution. Hardware and software technology continues to drive improvement in video games, with support for high-definition video at high framerates and for virtual and augmented reality-based games.

The term "video game" was originally used only for games that sent a video signal to a screen, such as a cathode-ray tube (CRT) or oscilloscope. Over time, the definition broadened to include any interactive electronic game that displays visuals for the player. The earliest known attempt at such a game was the cathode-ray tube amusement device, patented in 1947, which simulated missile fire on an oscilloscope. However, it was never mass-produced. In 1948, Alan Turing and David Champernowne designed Turochamp, a chess program, but it was too complex to run on the computers available at the time.

In the 1950s, games began to appear alongside early digital computers like Electronic Delay Storage Automatic Calculator (EDSAC). For example, Josef Kates built Bertie the Brain in 1950, a tic-tac-toe machine intended for exhibition rather than personal use. The following year, the Ferranti company demonstrated Nimrod, a computer programmed specifically to play the game of Nim. In 1952, Christopher Strachey created a Checkers game for the Ferranti Mark 1 computer, inspiring Arthur Samuel to develop one of the first checkers-playing artificial intelligence programs on IBM hardware. Military and research simulations, like CARMONETTE (Combined Arms Computer Model), which modeled ground combat scenarios, were also developed, though most of these games were dismantled or forgotten once their immediate purpose was completed. By the early 1950s, interactive visual games started to emerge. By the summer of 1952 the program 'Bouncing Ball', which ran on MIT's Whirlwind I computer, had been converted from a simple demonstration on the computer's CRT display into a game, by the addition of a hole in the 'floor' through which the eponymous ball might be made to pass. Also in 1952 Sandy Douglas created OXO on the EDSAC, allowing players to play tic-tac-toe on a CRT screen. Around the same time, Strachey and Stanley Gill experimented with visual games, while the Whirlwind I computer at MIT featured an early real-time ball simulation.

The University of Michigan developed a pool game using MIDSAC, one of EDSAC's successors, in 1954, which continuously updated graphics on screen. In 1958, William Higinbotham created Tennis for Two at Brookhaven National Laboratory, displaying a simplified tennis match on an oscilloscope; this is considered one of the first games created specifically for entertainment rather than research. In 1962, Spacewar! was developed for the PDP-1 minicomputer at MIT by Steve Russell and colleagues. It became the first widely shared video game, circulating across universities that had PDP-1 computers.

Modifications introduced features like a moving starfield, simulated gravity, and external controllers. Despite the PDP-1's high cost and rarity, Spacewar! inspired others in programming communities to create their own games. During the 1960s, other games also appeared on mainframes, including The Sumerian Game by Mabel Addis and early simulations written in general-purpose languages like BASIC. In 1966, while working at Sanders Associates, Ralph Baer began developing a television-based interactive game system. With a small team, he created the "Brown Box" prototype by 1968. It could run multiple games, including forms of table tennis and volleyball, directly on a TV set.

In the 1960s, a number of computer games were created for mainframe and minicomputer systems, but these failed to achieve wide distribution due to the continuing scarcity of computer resources, a lack of sufficiently trained programmers interested in crafting entertainment products, and the difficulty in transferring programs between computers in different geographic areas. By the end of the 1970s, however, the situation had changed drastically. The BASIC and C high-level programming languages were widely adopted during the decade, which were more accessible than earlier more technical languages such as FORTRAN and COBOL, opening up computer game creation to a larger base of users. With the advent of time-sharing, which allowed the resources of a single mainframe to be parceled out among multiple users connected to the machine by terminals, computer access was no longer limited to a handful of individuals at an institution, creating more opportunities for students to create their own games. Furthermore, the widespread adoption of the PDP-10, released by Digital Equipment Corporation (DEC) in 1966, and the portable UNIX operating system, developed at Bell Labs in 1971 and released generally in 1973, created common programming environments across the country that reduced the difficulty of sharing programs between institutions. Finally, the founding of the first magazines dedicated to computing like Creative Computing (1974), the publication of the earliest program compilation books like 101 BASIC Computer Games (1973), and the spread of wide-area networks such as the ARPANET allowed programs to be shared more easily across great distances.

As a result, many of the mainframe games created by college students in the 1970s influenced subsequent developments in the video game industry in ways that, Spacewar! aside, the games of the 1960s did not. In the arcade and on home consoles, fast-paced action and real-time gameplay were the norm in genres like racing and target shooting. On the mainframe, however, such games were generally not possible due both to the lack of adequate displays (many computer terminals continued to rely on teletypes rather than monitors well into the 1970s and even most CRT terminals could only render character-based graphics) and insufficient processing power and memory to update game elements in real time. While 1970s mainframes were more powerful than arcade and console hardware of the period, the need to parcel out computing resources to dozens of simultaneous users via time-sharing significantly hampered their abilities. Thus, programmers of mainframe games focused on strategy and puzzle-solving mechanics over pure action. Notable games of the period include the tactical combat game Star Trek (1971) by Mike Mayfield, the hide-and-seek game Hunt the Wumpus (1972) by Gregory Yob, and the strategic war game Empire (1977) by Walter Bright. Perhaps the most significant game of the period was Colossal Cave Adventure (or simply Adventure), created in 1976 by Will Crowther by combining his passion for caving with concepts from the newly released tabletop role-playing game (RPG) Dungeons & Dragons (D&D). Expanded by Don Woods in 1977 with an emphasis on the high fantasy of J.R.R. Tolkien, Adventure established a new genre based around exploration and inventory-based puzzle solving that made the transition to personal computers in the late 1970s. While most games were created on hardware of limited graphic ability, one computer able to host more impressive games was the PLATO system developed at the University of Illinois. Intended as an educational computer, the system connected hundreds of users all over the United States via remote terminals that featured high-quality plasma displays and allowed users to interact with each other in real time. This allowed the system to host an impressive array of graphical and/or multiplayer games, including some of the earliest known computer RPGs, which were primarily derived, like Adventure, from D&D, but unlike that game placed a greater emphasis on combat and character progression than puzzle solving. Starting with top-down dungeon crawls like The Dungeon (1975) and The Game of Dungeons (1975), more commonly referred to today by their filenames, pedit5 and dnd, PLATO RPGs soon transitioned to a first-person perspective with games like Moria (1975), Oubliette (1977), and Avatar (1979), which often allowed multiple players to join forces to battle monsters and complete quests together. Like Adventure, these games ultimately inspired some of the earliest personal computer games.

The modern video game industry grew out of the concurrent development of the first arcade video game and the first home video game console in the early 1970s in the United States. The arcade video game industry grew out of the pre-existing arcade game industry, which was previously dominated by electro-mechanical games (EM games). Following the arrival of Sega's EM game Periscope (1966), the arcade industry was experiencing a "technological renaissance" driven by "audio-visual" EM novelty games, establishing the arcades as a healthy environment for the introduction of commercial video games in the early 1970s. In the late 1960s, a college student Nolan Bushnell had a part-time job at an arcade where he became familiar with EM games, watching customers play and helping to maintain the machinery while learning how it worked and developing his understanding of how the game business operates. In 1966, while working at Sanders Associates, Ralph Baer came up with an idea for an entertainment device that could be hooked up to a television monitor. Presenting this to his superiors at Sanders and getting their approval, he, along with William Harrison and William Rusch, refined Baer's concept into the "Brown Box" prototype of a home video game console that could play a simple table tennis game. The three patented the technology, and Sanders, not in the commercialization business, sold licenses to the patents to Magnavox to commercialize. With Baer's help, Magnavox developed the Magnavox Odyssey, the first commercial home console, in 1972.

Concurrently, Nolan Bushnell and Ted Dabney had the idea of making a coin-operated system to run Spacewar! By 1971, the two had developed Computer Space with Nutting Associates, the first arcade video game. Bushnell and Dabney struck out on their own and formed Atari. Bushnell, inspired by the table tennis game on the Odyssey, hired Allan Alcorn to develop an arcade version of the game, this time using discrete transistor–transistor logic (TTL) electronic circuitry. Atari's Pong was released in late 1972 and is considered the first successful arcade video game. It ignited the growth of the arcade game industry in the United States from both established coin-operated game manufacturers like Williams, Chicago Coin, and the Midway subsidiary of Bally Manufacturing, and new startups such as Ramtek and Allied Leisure. Many of these were Pong clones using ball-and-paddle controls, and led to saturation of the market in 1974, forcing arcade game makers to try to innovate new games in 1975. Many of the newer companies created in the wake of Pong failed to innovate on their own and shut down, and by the end of 1975, the arcade market had fallen by about 50% based on new game sale revenues. Further, Magnavox took Atari and several other of these arcade game makers to court over violations of Baer's patents. Bushnell settled the suit for Atari, gaining perpetual rights for the patents for Atari as part of the settlement. Others failed to settle, and Magnavox won around $100 million in damages from these patent infringement suits before the patents expired in 1990.

Arcade video games caught on quickly in Japan due to partnerships between American and Japanese corporations that kept the Japan companies abreast of technology developments within the United States. The Nakamura Amusement Machine Manufacturing Company (Namco) partnered with Atari to import Pong into Japan in late 1973. Within the year, Taito and Sega released Pong clones in Japan by mid-1973. Japanese companies began developing novel games and exporting or licensing them through partners in 1974. Among these included Taito's Gun Fight (originally Western Gun in its Japanese release), which was licensed to Midway. Midway's version, released in 1975, was the first arcade video game to use a microprocessor rather than discrete TTL components. This innovation drastically reduced the complexity and time to design of arcade games and the number of physical components required to achieve more advanced gameplay.

5. Performance Evaluation & Extended Technical Observations The Magnavox Odyssey never caught on with the public, due largely to the limited functionality of its primitive discrete electronic component technology. By mid-1975, large-scale integration (LSI) microchips had become inexpensive enough to be incorporated into a consumer product. In 1975, Magnavox reduced the part count of the Odyssey using a three-chip set created by Texas Instruments and released two new systems that only played ball-and-paddle games, the Magnavox Odyssey 100 and Magnavox Odyssey 200. Atari, meanwhile, entered the consumer market that same year with the single-chip Home Pong system. The next year, General Instrument released a "Pong-on-a-chip" LSI and made it available at a low price to any interested company. Toy company Coleco Industries used this chip to create the million-selling Telstar console model series (1976–77). These initial home video game consoles were popular, leading to a large influx of companies releasing Pong and other video game clones to satisfy consumer demand. While there were only seven companies that were releasing home consoles in 1975, there were at least 82 by 1977, with more than 160 different models that year alone that were easily documented. A large number of these consoles were created in East Asia, and it is estimated that over 500 Pong-type home console models were made during this period. As with the prior paddle-and-ball saturation in the arcade game field by 1975 due to consumer weariness, dedicated console sales dropped sharply in 1978, disrupted by the introduction of programmable systems and Handheld electronic games. Just as dedicated consoles were waning in popularity in the West, they briefly surged in popularity in Japan. These TV geemu were often based on licensed designs from the American companies, manufactured by television manufacturers such as Toshiba and Sharp. Notably, Nintendo entered the video game market during this period alongside its current traditional and electronic toy product lines, producing the series of Color TV-Game consoles in partnership with Mitsubishi.

After the ball-and-paddle market saturation in 1975, game developers began looking for new ideas for games, buoyed by the ability to use programmable microprocessors rather than analog components. Taito designer Tomohiro Nishikado, who had developed Gun Fight previously, was inspired by Atari's Breakout to create a shooting-based game, Space Invaders, first released in Japan in 1978. Space Invaders introduced or popularized several important concepts in arcade video games, including play regulated by lives instead of a timer or set score, gaining extra lives through accumulating points, and the tracking of the high score achieved on the machine. It was also the first game to confront the player with waves of targets that shot back at the player and the first to include background music during game play, albeit a simple four-note loop. Space Invaders was an immediate success in Japan, with some arcades created solely for Space Invaders machines. While not quite as popular in the United States, Space Invaders became a hit as Midway, serving as the North American manufacturer, moved over 60,000 cabinets in 1979.

Space Invaders led off what is considered to be the golden age of arcade games which lasted from 1978 to 1982. Several influential and best-selling arcade games were released during this period from Atari, Namco, Taito, Williams, and Nintendo, including Asteroids (1979), Galaxian (1979), Defender (1980), Missile Command (1980), Tempest (1981), and Galaga (1981). Pac-Man, released in 1980, became a popular culture icon, and a new wave of games appeared that focused on identifiable characters and alternate mechanics such as navigating a maze or traversing a series of platforms. Aside from Pac-Man and its sequel, Ms. Pac-Man (1982), the most popular games in this vein during the golden age were Donkey Kong (1981) and Q*bert (1982). Games like Pac-Man, Donkey Kong and Q*bert also introduced the concept of narratives and characters to video games, which led companies to adopt these later as mascots for marketing purposes. According to trade publication Vending Times, revenues generated by coin-operated video games on location in the United States jumped from $308 million in 1978 to $968 million in 1979 to $2.8 billion in 1980. As Pac Man ignited an even larger video game craze and attracted more female players to arcades, revenues jumped again to $4.9 billion in 1981. According to trade publication Play Meter, by July 1982, total coin-op collections peaked at $8.9 billion, of which $7.7 billion came from video games. Dedicated video game arcades grew during the golden age, with the number of arcades (locations with at least ten arcade games) more than doubling between July 1981 and July 1983 from over 10,000 to just over 25,000. These figures made arcade games the most popular entertainment medium in the country, far surpassing both pop music (at $4 billion in sales per year) and Hollywood films ($3 billion).

Development costs of dedicated game hardware for arcade and home consoles based on discrete component circuitry and application-specific integrated circuits (ASICs) with only limited consumer lifespans drove engineers to find alternatives. Microprocessors had dropped far enough in price by 1975 to make these a viable option for developing programmable consoles that could load in game software from a form of swappable media. The Fairchild Channel F by Fairchild Camera and Instrument was released in 1976. It is the first home console to use programmable ROM cartridges - allowing players to swap games - as well as being the first home console to use a microprocessor which reads instructions from the ROM cartridge.

Atari and Magnavox followed suit in 1977 and 1978, respectively, with the release of the Atari Video Computer System (VCS, later known as the Atari 2600) and the Magnavox Odyssey 2, both systems also introducing the use of cartridges. As to complete the Atari VCS quickly, Bushnell sold Atari to Warner Communications $28 million, providing the necessary cash infusion to complete the system's design by the end of 1977. The initial market for these new consoles were initially modest as consumers were still wary after the saturation of dedicated home consoles. However, there was still newfound interest in video games, and new players were drawn to the market, such as Mattel Electronics with the Intellivision. In contrast to the dedicated home Pong consoles, programmable cartridge-based consoles had a higher barrier of entry with the costs of research & development and large-scale production, and fewer manufacturers entered the market during this period. This new line of consoles had its breakthrough moment when Atari obtained a license from Taito to create the Atari VCS version of the arcade hit Space Invaders, which was released in 1980. Space Invaders quadrupled sales of the Atari VCS, making it the first "killer app" in the video game industry, and the first video game to sell over one million copies and eventually sold over 2.5 million by 1981. Atari's consumer sales almost doubled from $119 million to nearly $204 million in 1980 and then exploded to over $841 million in 1981, while sales across the entire video game industry in the United States rose from $185.7 million in 1979 to just over $1 billion in 1981. Through a combination of conversions of its own arcade games like Missile Command and Asteroids and licensed conversions like Defender, Atari took a commanding lead in the industry, with an estimated 65% market share of the worldwide industry by dollar volume by 1981. Mattel settled into second place with roughly 15%-20% of the market, while Magnavox ran a distant third, and Fairchild exited the market entirely in 1979. Another critical development during this period was the emergence of third-party developers. Atari management did not appreciate the special talent required to design and program a game and treated them like typical software engineers of the period, who were not generally credited for their work or given royalties; this led to Warren Robinett secretly programming his name in one of the earliest Easter eggs into his game Adventure. Atari's policies drove four of the company's programmers, David Crane, Larry Kaplan, Alan Miller, and Bob Whitehead, to resign and form their own company Activision in 1979, using their knowledge of developing for the Atari VCS to make and publish their own games. Atari sued to stop Activision's activities, but the companies settled out of court, with Activision agreeing to pay a portion of their game sales as a license fee to Atari. Another group of Atari and Mattel developers left and formed Imagic in 1981, following Activision's model. Atari's dominance of the market was challenged by Coleco's ColecoVision in 1982. As Space Invaders had done for the Atari VCS, Coleco developed a licensed version of Nintendo's arcade hit Donkey Kong as a bundled game with the system. While the Colecovision only had 17% of the hardware market in 1982 compared to the Atari VCS' share of 58%, it outsold Atari's newer console, the Atari 5200. A few games from this period have been considered milestones in the history of video games, and some of the earliest in popular genres. Robinett's Adventure was inspired from the text adventure Colossal Cave Adventure, and is considered one of the first graphic adventure and action-adventure games, and first cartridge fantasy-themed game. Activision's Pitfall!, beside being one of the more successful third-party games, also established the foundation of side-scrolling platform games. Utopia for the Intellivision was the first city-building game and considered one of the first real-time strategy games.

The fruit of retail development in early video games appeared mainly in video arcades and home consoles, but at the same time, there was a growing market in home computers. Such home computers were initially a hobbyist activity, with minicomputers such as the Altair 8800 and the IMSAI 8080 released in the early 1970s. Groups like the Homebrew Computer Club in Menlo Park, California envisioned how to create new hardware and software from these minicomputer systems that could eventually reach the home market. Affordable home computers began appearing in the late 1970s with the arrival of the "1977 Trinity": the Commodore PET, the Apple II, and the TRS-80. Most shipped with a variety of pre-made games as well as the BASIC programming language, allowing their owners to program simple games. Hobbyist groups for the new computers soon formed and PC game software followed. Soon many of these games—at first clones of mainframe classics such as Star Trek, and then later ports or clones of popular arcade games such as Space Invaders, Frogger, Pac-Man (see Pac-Man clones) and Donkey Kong—were being distributed through a variety of channels, such as printing the game's source code in books (such as David Ahl's BASIC Computer Games), magazines (Electronic Games and Creative Computing), and newsletters, which allowed users to type in the code for themselves.

Whereas hobbyist programming in the United States was seen as a pastime while more players flocked to video game consoles, such "bedroom coders" in the United Kingdom and other parts of Europe looked for ways to profit from their work. Programmers distributed their works through the physical mailing and selling of floppy disks, cassette tapes, and ROM cartridges. Possibly the first computer game to be sold commercially was Microchess in 1976 by Peter R. Jennings, who also started possibly the first computer game publishing company, Microware. Soon a small cottage industry was formed, with amateur programmers selling disks in plastic bags put on the shelves of local shops or sent through the mail. Mainframe and minicomputer games were still largely developed by students and others during this period using the more powerful languages afforded on these systems. A team of MIT students, Tim Anderson, Marc Blank, Bruce Daniels, and Dave Lebling, were inspired by Colossal Cave Adventure to create the text adventure game Zork across 1977 and 1979, and later formed Infocom to republish it commercially in 1980. The first graphical adventure games from Sierra On-Line such as Mystery House, using simple graphics alongside text, also emerged around the same time. Rogue, the namesake of the roguelike genre, was developed in 1980 by Glenn Wichman and Michael Toy who wanted a way to randomize the gameplay of Colossal Cave Adventure.

Handheld electronic games, using all computerized components but typically using LED or VFD lights for display, first emerged in the early 1970s. LCD displays became inexpensive for consumer products by the mid-1970s and replaced LED and VFD in such games, due to their lower power usage and smaller size. Most of these games were limited to a single game due to the simplicity of the display. Companies like Mattel Electronics, Coleco, Entex Industries, Bandai, and Tomy made numerous electronics games over the 1970s and early 1980s. Coupled with inexpensive microprocessors, handheld electronic games paved the way for the earliest handheld video game systems by the late 1970s. In 1979, Milton Bradley Company released the first handheld system using interchangeable cartridges, Microvision, which used a built-in LCD matrix screen. While the handheld received modest success in its first year of production, the lack of games, screen size and video game crash of 1983 brought about the system's quick demise. In 1980, Nintendo released the first of its Game & Watch line, handheld electronic games using LCD screens. Game & Watch spurred dozens of other game and toy companies to make their own portable games, many of which were copies of Game & Watch games or adaptations of popular arcade games.

Tiger Electronics borrowed this concept of videogaming with cheap, affordable handhelds and still produces games on this model to the present day. The video games industry experienced its first major growing pains in the early 1980s; the lure of the market brought many companies with little experience to try to capitalize on video games, and contributors towards the industry's crash in 1983, decimating the North American market. In the wake of the crash, Japanese companies became the leaders in the industry, and as the industry began to recover, the first major publishing houses appeared, maturing the industry to prevent a similar crash in the future.

Activision's success as a third-party developer for the Atari VCS and other home consoles inspired other third-party development firms to emerge in the early 1980s; by 1983, at least 100 different companies claimed to be developing software for the Atari VCS. This had been projected to led to a glut in sales, with only 10% of games producing 75% of sales for 1983 based on 1982 estimates. Further, there were questions on the quality of these games. While some of these firms hired experts in game design and programming to build quality games, most were staffed by novice programmers backed by venture capitalists without experience in the area. As a result, the Atari VCS market became watered down with large quantities of poor quality games. These games did not sell well, and retailers discounted their prices to try to get rid of their inventory. This further impacted sales of high-quality games, since consumers would be drawn to purchase bargain-bin priced games over quality games marked at a regular price. At the end of 1983, several factors, including a market flooded with poor-quality games and loss of publishing control, the lack of consumer confidence in market leader Atari due to the poor performance of several high-profile games, and home computers emerging as a new and more advanced platform for games at nearly the same cost as video game consoles, caused the North American video game industry to experience a severe downturn. The 1983 crash bankrupted several North American companies that produced consoles and games from late 1983 to early 1984. The $3 billion U.S. market in 1983 dropped to $100 million by 1985, while the global video game market estimated at $42 billion in 1982 fell to $14 billion by 1985. Warner Communications sold off Atari to Jack Tramiel in 1984, while Magnavox and Coleco exited the industry. The crash had some minor effects on Japanese companies with American partners impacted by the crash, but as most of the Japanese companies involved in video games at this point have long histories, they were able to weather the short-term effects. The crash set the stage for Japan to emerge as the leader in the video game industry for the next several years, particularly with Nintendo's introduction of the rebranded Famicom, the Nintendo Entertainment System, back into the U.S. and other Western regions in 1985, maintaining strict publishing control to avoid the same factors that led to the 1983 crash.

Following the success of the Apple II and Commodore PET in the late 1970s, a series of cheaper and incompatible home computers emerged in the early 1980s. This second batch included the VIC-20 and Commodore 64; Sinclair ZX80, ZX81 and ZX Spectrum; NEC PC-8000, PC-6001, PC-88 and PC-98; Sharp X1 and X68000; Fujitsu FM Towns, and Atari 8-bit computers, BBC Micro, Acorn Electron, Amstrad CPC, and MSX series. Many of these systems found favor in regional markets. These new systems helped catalyze both the home computer and game markets, by raising awareness of computing and gaming through their competing advertising campaigns. This was most notable in the United Kingdom where the BBC encouraged computer education and backed the development of the BBC Micro with Acorn. Between the BBC Micro, the ZX Spectrum, and the Commodore 64, a new wave of "bedroom coders" emerged in the United Kingdom and started selling their own software for these platforms, alongside those developed by small professional teams. Small publishing and distribution companies such as Acornsoft and Mastertronic were established to help these individuals and teams to create and sell copies of their games. Ubisoft started out as such a distributor in France in the mid-1980s before they branched out into video game development and publishing. In Japan, systems like the MSX and the NEC PC line were popular, and several development houses emerged developing arcade clones and new games for these platforms. These companies included HAL Laboratory, Square, and Enix, which all later became some of the first third-party developers for the Nintendo Famicom after its release in 1983. Games from this period include the first Ultima by Richard Garriott and the first Wizardry from Sir-Tech, both fundamental role-playing games on the personal computer. The space trading and combat simulation game Elite by David Braben and Ian Bell introduced a number of new graphics and gameplay features, and is considered one of the first open world and sandbox games. Early installments in a number of long-running franchises such as Castlevania, Metal Gear, Bubble Bobble, Gradius, as well as ports of console games and visual novels appeared on Japanese platforms like the PC88, X68000, and MSX.

Games dominated home computers' software libraries. A 1984 compendium of reviews of Atari 8-bit software used 198 pages for games compared to 167 for all others. By that year the computer game market took over from the console market following the crash of that year; computers offered equal ability and, since their simple design allowed games to take complete command of the hardware after power-on, they were nearly as simple to start playing with as consoles. Later in the 1980s the next wave of personal computers emerged, with the Amiga and Atari ST in 1985. Both computers had more advanced graphics and sound capabilities than the prior generation of computers, and made for key platforms for video game development, particularly in the United Kingdom. The bedroom coders had since formed development teams and started producing games for these systems professionally. These included Bullfrog Productions, founded by Peter Molyneux, with the release of Populous (the first such god game), DMA Design with Lemmings, Psygnosis with Shadow of the Beast, and Team17 with Worms.

Harvested Online Documentation & Reference Sources • https://en.wikipedia.org/wiki/List%20of%20free%20and%20open-source%20software%20packages • https://en.wikipedia.org/wiki/History%20of%20video%20games • https://en.wikipedia.org/wiki/Circular%20economy