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
OpenKore is an automation tool for Ragnarok Online
Air traffic control tower and radar simulator (solo + multi-player)
Odamex is a free, cross-platform, modern client-server Doom engine
Classic America's Army
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Ur-Quan Masters High Definition
The All-in-One music game
Super Smash Flash 2 is the most must-play battle game with 28 classic
Open source voxel world
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
Cooperative multiplayer graphical RPG and adventure game
Free 3D Roguelike action RPG
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
A fun realistic multiplayer free-and-open-source first-person-shooter!