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