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.
Factorio-like tower defense game. Build production chains to gather more resources, and build complex facilities.
Ad-less chess server powering lichess.org, with official iOS and Android client apps.
Minimalist text adventure game for your browser.
Transport tycoon simulation game.
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.
Multiplayer RPG. Open-source game inspired by Cube World, Legend of Zelda, Dwarf Fortress and Minecraft.