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.
0 A.D. is a free, open-source, cross-platform real-time strategy game.
A collection of all maps and games made for the TripleA game engine
Air traffic control tower and radar simulator (solo + multi-player)
Ur-Quan Masters High Definition
Cooperative multiplayer graphical RPG and adventure game
Classic America's Army
Odamex is a free, cross-platform, modern client-server Doom engine
Open source voxel world
Opensource Created Custom Viewers For Virtual Worlds like SecondLife.
OpenKore is an automation tool for Ragnarok Online
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
Super Smash Flash 2 is the most must-play battle game with 28 classic
An online multiplayer real time strategy game
The All-in-One music game
A fun realistic multiplayer free-and-open-source first-person-shooter!