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.
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
Odamex is a free, cross-platform, modern client-server Doom engine
An open source reimplementation of the Among Us Server
Ur-Quan Masters High Definition
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Cooperative multiplayer graphical RPG and adventure game
Free 3D Roguelike action RPG
OpenKore is an automation tool for Ragnarok Online
Opensource Created Custom Viewers For Virtual Worlds like SecondLife.
Air traffic control tower and radar simulator (solo + multi-player)
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
A fun realistic multiplayer free-and-open-source first-person-shooter!
Super Smash Flash 2 is the most must-play battle game with 28 classic
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
Open source voxel world