Browse free open source Multiplayer games and projects 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
Classic America's Army
OpenKore is an automation tool for Ragnarok Online
Opensource Created Custom Viewers For Virtual Worlds like SecondLife.
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Air traffic control tower and radar simulator (solo + multi-player)
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
The All-in-One music game
Open source voxel world
Ur-Quan Masters High Definition
Odamex is a free, cross-platform, modern client-server Doom engine
FiveM (GTA: V, Grand Theft Auto V Multiplayer) utilities
Cooperative multiplayer graphical RPG and adventure game
Super Smash Flash 2 is the most must-play battle game with 28 classic
Free 3D Roguelike action RPG
An open source reimplementation of the Among Us Server