OpenTTD

Competitive top-down shooter blending Counter-Strike with Hotline Miami. Runs on Linux, Windows, MacOS and the Web.

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.

Add network play functionality to Rockstar North's Grand Theft Auto game series, in which this functionality is not originally found.

Cooperative platformer version of DDRace, a Teeworlds modification featuring unique cooperative gameplay.

Quiz game platform, designed for smaller events (alternative to Kahoot!).

Turn-based tactical strategy game with a high fantasy theme, featuring both singleplayer and online/hotseat multiplayer combat.