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