Warsow is described as 'completely free fast-paced first-person shooter (FPS) for Windows, Linux and Mac OS X, set in a futuristic cartoonish world where rocketlauncher-wielding pigs and'. There are more than 10 games similar to Warsow for a variety of platforms, including Windows, Linux, Mac, BSD and Steam. The best alternative is Xonotic, which is both free and Open Source. Other Warsow like games are Unreal Tournament (Free, Open Source), Quake (Paid), Cube 2: Sauerbraten (Free, Open Source) and Overwatch (Paid).
- Freedoom is a WIP a complete free content game based on the Doom engine. It's not an engine, but it's replacement game data with entirely original content, Compatible with a majority of game mods made for Doom. Comes in Three Flavors~. View 21 alternatives to Freedoom
- Free • Open Source