Odamex is a free, cross-platform, modern client-server Doom engine
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
Cross-platform real-time strategy game (3D)
A free 3d game for PC that does not limit the player. Fight,Build,Gain
tour based strategic game
A Endless running game set in desert filled with obstacles
Snakes of Apocalypse is a funny multiplayer game
A fun realistic multiplayer free-and-open-source first-person-shooter!
Ur-Quan Masters High Definition
WeComeInPeace is a simple RTS game that aims towards multiplayer
oGame-like browser space realtime strategy game based on xNova
X3D Prototypes for the SMUOS Component
Cosmos Tycoon is a open source transport simulation browser game.
A Multiplayer Bao (Bawo) App for GNU
A collection of all maps and games made for the TripleA game engine
Simple meta-server for locating other multiplayer servers
a Human and Artificial Intelligence Network
canarymod plugin to play capture the flag on minecraft
Java decentralized cross-platform network multiplayer game engine