Zero-K

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.

Ad-less chess server powering lichess.org, with official iOS and Android client apps.

Factorio-like tower defense game. Build production chains to gather more resources, and build complex facilities.

Transport tycoon simulation game.

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.