- [A Dark Room](https://github.com/doublespeakgames/adarkroom) - Minimalist text adventure game for your browser. ([Demo](https://adarkroom.doublespeakgames.com/)) `MPL-2.0``Javascript`
- [Digibuzzer](https://digibuzzer.app/) - Create a virtual game room around a connected buzzer (documentation in French). ([Demo](https://digibuzzer.app/), [Source Code](https://codeberg.org/ladigitale/digibuzzer)) `AGPL-3.0``Nodejs`
- [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/lichess-org/lila)) `AGPL-3.0``Scala`
- [Luanti](https://www.luanti.org/) - An open source voxel game engine (formerly Minetest). 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++/Lua/deb`
- [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/MIT/Zlib``C++/deb`
- [MTA:SA](https://multitheftauto.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++`
- [OpenTTD](https://www.openttd.org/) - Open source transport tycoon simulation game. ([Source Code](https://github.com/OpenTTD/OpenTTD), [Clients](https://bananas.openttd.org/)) `GPL-2.0``C++/Docker`
- [piqueserver](https://github.com/piqueserver/piqueserver) - Server for openspades, the first-person shooter in a destructible voxel world. ([Clients](https://github.com/yvt/openspades)) `GPL-3.0``Python/C++`