- [Legend of the Green Dragon](https://github.com/lotgd/core) - Legend of the Green Dragon is a text-based RPG originally developed by Eric Stevens and JT Traub as a remake of and homage to the classic BBS Door game, Legend of the Red Dragon, by Seth Able Robinson. ([Demo](http://lotgd.net/)) `AGPL-3.0``PHP`
- [Lila](https://lichess.org/) - The forever free, adless and open source chess server powering lichess.org, with official iOS and Android client apps. ([Source Code](https://github.com/ornicar/lila)) `AGPL-3.0``Scala`
- [Mindustry](https://mindustrygame.github.io/) - Factorio-like tower defense game. Build production chains to gather more resources, and build complex facilities. ([Source Code](https://github.com/Anuken/Mindustry)) `GPL-3.0``Java`
- [Minetest](https://www.minetest.net/) - An open source voxel game engine. Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server. ([Source Code](https://github.com/minetest/minetest)) `LGPL-2.1/CC-BY-SA-3.0/Other``C++`
- [Minetest](https://www.minetest.net/) - An open source voxel game engine. Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server. ([Source Code](https://github.com/minetest/minetest)) `LGPL-2.1/MIT/Zlib``C++`
- [MTA:SA](https://mtasa.com/) `⚠` - Multi Theft Auto (MTA) is a software project that adds network play functionality to Rockstar North's Grand Theft Auto game series, in which this functionality is not originally found. ([Source Code](https://github.com/multitheftauto/mtasa-blue)) `GPL-3.0``C++`
- [Net64+](https://net64-mod.github.io) `⚠` - Net64 aka SM64O allows playing Super Mario 64 in an online multiplayer mode. Net64+ is the official continuation of the program and features an integrated server list. ([Source Code](https://github.com/Tarnadas/net64plus-server/), [Clients](https://github.com/Tarnadas/net64plus/)) `MIT``Nodejs`
- [node-virtual-gamepads](https://github.com/jehervy/node-virtual-gamepads) - Turn your smartphone into a game controller, keyboard, or touchpad for a remote Linux OS machine. `MIT``Nodejs/CoffeScript`
- [QuakeJS](https://github.com/begleysm/quakejs) - QuakeJS is a port of ioquake3 to Javascript that can be played in a browser. `MIT``Nodejs`
- [Quizmaster](https://github.com/nymanjens/quizmaster) - A web-app for conducting a quiz, including a page for players to enter their answers. `Apache-2.0``Scala`
- [SourceBans++](https://sbpp.github.io) - Admin, ban, and communication management system for games running on the Source engine. ([Source Code](https://github.com/sbpp/sourcebans-pp)) `CC-BY-SA-4.0``PHP`
- [The Battle for Wesnoth](https://github.com/wesnoth/wesnoth) - The Battle for Wesnoth is an Open Source, turn-based tactical strategy game with a high fantasy theme, featuring both singleplayer and online/hotseat multiplayer combat. `GPL-2.0``C++`
- [Word Mastermind](https://github.com/clupasq/word-mastermind) - Wordle clone. A Mastermind-like game, but instead of colors you need to guess words. ([Demo](https://word-mastermind.glitch.me/)) `MIT``Nodejs`
- [Wordle](https://reactle.vercel.app/) - An Open Source Wordle game. Guess the Wordle in six tries. Each guess must be a valid five-letter word. ([Source Code](https://github.com/cwackerfuss/react-wordle)) `MIT``Nodejs`
- [GraphHopper](https://graphhopper.com/) - Fast routing library and server using OpenStreetMap. ([Source Code](https://github.com/graphhopper/graphhopper)) `Apache-2.0``Java`
- [H3 Viewer](https://github.com/clupasq/h3-viewer) - View/search Uber H3 (Hexagonal Hierarchical Spatial Index) cells on a map. ([Demo](https://wolf-h3-viewer.glitch.me/)) `Apache-2.0``HTML5`
- [Hauk](https://github.com/bilde2910/Hauk) - Easy to setup location sharing platform that lets you temporarily share your location with anyone in real-time. ([Demo](https://github.com/bilde2910/Hauk#demo-server)) `Apache-2.0``PHP`
- [MapBBCodeShare](https://github.com/MapBBCode/share.mapbbcode.org) - Tool for sharing custom OSM maps. Support for annotated markers, polygons, lines, multi-format import/export, multiple layers, shortlinks. ([Demo](http://share.mapbbcode.org/)) `WTFPL/Other``PHP`
- [MapBBCodeShare](https://github.com/MapBBCode/share.mapbbcode.org) - Tool for sharing custom OSM maps. Support for annotated markers, polygons, lines, multi-format import/export, multiple layers, shortlinks. ([Demo](http://share.mapbbcode.org/)) `WTFPL``PHP`
- [Nominatim](https://nominatim.org/) - Server application for reverse geocoding (address -> coordinates) on OpenStreetMap data. ([Source Code](https://github.com/osm-search/Nominatim)) `GPL-2.0``C`
- [Open Source Routing Machine (OSRM)](http://project-osrm.org/) - High performance routing engine designed to run on OpenStreetMap data and offering an HTTP API, C++ library interface, and Nodejs wrapper. ([Demo](https://map.project-osrm.org/), [Source Code](https://github.com/Project-OSRM/osrm-backend)) `BSD-2-Clause``C++`
- [OpenGTS](http://www.opengts.org/) - Entry-level fleet tracking system. Supports variety of tracking devices and protocols. Comes with rich web-interface and reporting features. ([Demo](http://track.opengts.org/track/Track), [Source Code](https://sourceforge.net/projects/opengts/files/server-base/)) `Apache-2.0``Java`
@ -1357,7 +1357,7 @@ _Related: [Wikis](#wikis)_
- [Collabora Online Development Edition](https://www.collaboraoffice.com/code) - Collabora Online Development Edition (CODE) is a powerful LibreOffice-based online office that supports all major document, spreadsheet and presentation file formats, which you can integrate in your own infrastructure. ([Source Code](https://cgit.freedesktop.org/libreoffice/online/)) `MPL-2.0``C++`
- [CryptPad](https://cryptpad.fr/) - CryptPad is the zero knowledge realtime collaborative editor (rich-text, files, source-code, ...). ([Source Code](https://github.com/xwiki-labs/cryptpad)) `AGPL-3.0``Nodejs`
- [EtherCalc](https://ethercalc.net/) - Web spreadsheet. ([Source Code](https://github.com/audreyt/ethercalc)) `CPAL-1.0/Other``Nodejs`
- [EtherCalc](https://ethercalc.net/) - Web spreadsheet. ([Source Code](https://github.com/audreyt/ethercalc)) `CPAL-1.0/Artistic-2.0``Nodejs`
- [Etherpad](https://etherpad.org/) - Etherpad is a highly customizable Open Source online editor providing collaborative editing in really real-time. ([Demo](https://demo.sandstorm.io/appdemo/h37dm17aa89yrd8zuqpdn36p6zntumtv08fjpu8a8zrte7q1cn60), [Source Code](https://github.com/ether/etherpad-lite)) `Apache-2.0``Nodejs`
- [Grist](https://getgrist.com/) - Grist is a next-generation spreadsheet with relational structure, formula-based access control, and a portable, self-contained format. Alternative to Airtable. ([Demo](https://docs.getgrist.com), [Source Code](https://github.com/gristlabs/grist-core)) `Apache-2.0``Nodejs/Python`
- [Infinoted](https://github.com/gobby/gobby/wiki/Dedicated%20Server) - Server for [Gobby](https://github.com/gobby/gobby/wiki), a multi-platform collaborative text editor. ([Source Code](https://github.com/gobby/gobby)) `MIT``C++`