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
An open source reimplementation of the Among Us Server
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Opensource Created Custom Viewers For Virtual Worlds like SecondLife.
Classic America's Army
Air traffic control tower and radar simulator (solo + multi-player)
Odamex is a free, cross-platform, modern client-server Doom engine
Ur-Quan Masters High Definition
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
The All-in-One music game
Open source voxel world
OpenKore is an automation tool for Ragnarok Online
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
A fun realistic multiplayer free-and-open-source first-person-shooter!