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
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Opensource Created Custom Viewers For Virtual Worlds like SecondLife.
Classic America's Army
Air traffic control tower and radar simulator (solo + multi-player)
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
Open source voxel world
The All-in-One music game
Odamex is a free, cross-platform, modern client-server Doom engine
Ur-Quan Masters High Definition
Cooperative multiplayer graphical RPG and adventure game
A fun realistic multiplayer free-and-open-source first-person-shooter!
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
OpenKore is an automation tool for Ragnarok Online
An open source reimplementation of the Among Us Server
Free 3D Roguelike action RPG
An online multiplayer real time strategy game