Browse free open source First Person Shooters and projects for Windows below. Use the toggles on the left to filter open source First Person Shooters by OS, license, language, programming language, and project status.
A modern, cross-platform Quake game engine based on FitzQuake.
A cross-platform port of Hexen II game.
Odamex is a free, cross-platform, modern client-server Doom engine
Free and open source FPS based on Quake III Arena
Classic America's Army
DOOM / Heretic / Hexen source port with enhanced graphics and UI
AssaultCube is a FREE, multiplayer, first-person shooter game.
Source port of Doom, Heretic, Hexen and Strife developed in Delphi
Battlefield bad company 2 Master server emulator + Server R34
FreeCS is a free-software reimplementation of Counter-Strike 1.5.