Browse free open source Multiplayer games and projects for Windows below. Use the toggles on the left to filter open source Multiplayer games by OS, license, language, programming language, and project status.
A collection of all maps and games made for the TripleA game engine
The All-in-One music game
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Classic America's Army
Odamex is a free, cross-platform, modern client-server Doom engine
Cooperative multiplayer graphical RPG and adventure game
Ur-Quan Masters High Definition
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
Air traffic control tower and radar simulator (solo + multi-player)
OpenKore is an automation tool for Ragnarok Online
A fun realistic multiplayer free-and-open-source first-person-shooter!
Free 3D Roguelike action RPG
Free-to-play multiplayer version of the 8-bit classic M.U.L.E.
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
Super Smash Flash 2 is the most must-play battle game with 28 classic