Odamex is a free, cross-platform, modern client-server Doom engine
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Cross-platform real-time strategy game (3D)
An unmodified version of the MMORPG Impressive Title by KovuLKD
Out battleship is back. Destroy everything in the space!
a Starship Troopers mod
An online multiplayer real time strategy game
Alternative Teeworlds Client with many exciting features!
A fun realistic multiplayer free-and-open-source first-person-shooter!
WeComeInPeace is a simple RTS game that aims towards multiplayer
An open-source, multiplayer fps based on Cube 2 Engine.
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
A minimalist multiplayer game inspired by Astro Party, for Windows.
3D Space Station Simulator (inspired by SS13)
PvP, MUD RPG.
Clone of Urban Assault with new Graphics.