Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Cooperative multiplayer graphical RPG and adventure game
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Odamex is a free, cross-platform, modern client-server Doom engine
GameServer is a sophisticated, game server designed for online games
A 2D multiplayer space shooter game
A fun realistic multiplayer free-and-open-source first-person-shooter!
Tools for Super Tux Kart server operators
Cross-platform real-time strategy game (3D)
An unmodified version of the MMORPG Impressive Title by KovuLKD
mGSTEP port of the Cube game engine
Alternative Teeworlds Client with many exciting features!
WeComeInPeace is a simple RTS game that aims towards multiplayer
Multiplayer Rogue-like combat game
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
starrydb is game server engine
Community fork of the Cube 2: Sauerbraten game.
Converts Minecraft world files between formats to allow editing
A 2D Platformer Shooter game