Odamex is a free, cross-platform, modern client-server Doom engine
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
0 A.D. is a free, open-source, cross-platform real-time strategy game.
A 2D multiplayer space shooter game
Cross-platform real-time strategy game (3D)
Tools for Super Tux Kart server operators
An unmodified version of the MMORPG Impressive Title by KovuLKD
Out battleship is back. Destroy everything in the space!
BDEF, WIE, MInfantry AI opponent
a Starship Troopers mod
An online multiplayer real time strategy game
mGSTEP port of the Cube game engine
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
Multiplayer Rogue-like combat game