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.
Odamex is a free, cross-platform, modern client-server Doom engine
A collection of all maps and games made for the TripleA game engine
Classic America's Army
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
0 A.D. is a free, open-source, cross-platform real-time strategy game.
A 2D Real Time Strategy space combat game.
OpenKore is an automation tool for Ragnarok Online
The All-in-One music game
Ur-Quan Masters High Definition
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
Free 3D Roguelike action RPG
Cooperative multiplayer graphical RPG and adventure game
Air traffic control tower and radar simulator (solo + multi-player)
An open source reimplementation of the Among Us Server
A fun realistic multiplayer free-and-open-source first-person-shooter!