0 A.D. - Cross-platform real-time strategy game of ancient warfare. (Source Code) MIT/GPL-2.0/ZlibC++/C/deb
A Dark Room - Minimalist text adventure game for your browser. (Demo) MPL-2.0Javascript
Digibuzzer - Create a virtual game room around a connected buzzer (documentation in French). (Demo, Source Code) AGPL-3.0Nodejs
Lila - Ad-less chess server powering lichess.org, with official iOS and Android client apps. (Source Code) AGPL-3.0Scala
Luanti - 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) LGPL-2.1/MIT/ZlibC++/Lua/deb
Mindustry - Factorio-like tower defense game. Build production chains to gather more resources, and build complex facilities. (Source Code) GPL-3.0Java
MTA:SA⚠ - Add network play functionality to Rockstar North's Grand Theft Auto game series, in which this functionality is not originally found. (Source Code) GPL-3.0C++
Quizmaster - Web application for conducting a quiz, including a page for players to enter their answers. Apache-2.0Scala
Red Eclipse 2 - A FOSS Arena First-Person Shooter Similar to Unreal Tournament. (Source Code) Zlib/MIT/CC-BY-SA-4.0C/C++/deb
Scribble.rs - A web-based pictionary game. (Demo) BSD-3-ClauseGo/Docker
Suroi - An open-source 2D battle royale game inspired by surviv.io. (Demo, Source Code) GPL-3.0Nodejs
The Battle for 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-2.0C++/deb
Veloren - Multiplayer RPG. Open-source game inspired by Cube World, Legend of Zelda, Dwarf Fortress and Minecraft. (Source Code) GPL-3.0Rust
Word Mastermind - Wordle clone. A Mastermind-like game, but instead of colors you need to guess words. (Demo) MITNodejs
Zero-K - Open Source on Springrts engine. Zero-K is a traditional real time strategy game with a focus on player creativity through terrain manipulation, physics, and a large roster of unique units - all while being balanced to support competitive play. (Source Code) GPL-2.0Lua