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
Opensource Created Custom Viewers For Virtual Worlds like SecondLife.
Classic America's Army
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
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Ur-Quan Masters High Definition
Odamex is a free, cross-platform, modern client-server Doom engine
Cooperative multiplayer graphical RPG and adventure game
An open source reimplementation of the Among Us Server
PINN/NOOBS compatible linux distro of DreamPi for the Sega Dreamcast
OpenKore is an automation tool for Ragnarok Online
A fun realistic multiplayer free-and-open-source first-person-shooter!
Open source voxel world
Free 3D Roguelike action RPG