Alternatives to Tremulous for all platforms with any license

Xonotic

Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux. The project is geared towards providing addictive arena shooter gameplay...

Free Open Source Mac Windows Linux BSD PortableApps.com
First Person Shooter (FPS) OPENGL Portable Real time collaboration Add a feature

78 Like
Counter-Strike

Fast-paced, multiplayer FPS game series where teams combat for objectives as terrorists or counter-terrorists.
- Tremulous is base building, non-humanoid Alien vs. Human gameplay. Guest • Aug 2020
Freemium Mac Windows Linux Steam Playstation ... Xbox
Rewards the best answers First Person Shooter (FPS) Multiplayer Works Offline ... Shooting Add a feature

126 Like
Doom

Doom is a science fiction horror-themed first-person shooter video game in which players assume the role of a space marine, popularly known as "Doomguy", who...

Commercial Windows Steam Nintendo Switch Online Xbox Stadia
First person view Single player First Person Shooter (FPS) Multiplayer ... Sci-fi Add a feature

51 Like
Quake

Quake is a series of first-person shooter video games released by id Software. In the game, players must find their way out of various maze-like, medieval...

Commercial Mac Windows Linux Steam
First Person Shooter (FPS) Sci-fi Add a feature

89 Like
Warsow

Warsow is a completely free fast-paced first-person shooter (FPS) for Windows, Linux and Mac OS X, set in a futuristic cartoonish world where rocketlauncher-wielding...

Free Open Source Mac Windows Linux Web
First Person Shooter (FPS) Add a feature

30 Like
Cube 2: Sauerbraten

Cube 2: Sauerbraten is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS. Much like the original Cube, the aim of this...
- Discontinued
  No more updates since Jan 2013 : http://sauerbraten.org/ . 2013, like Alien Arena, noticed discontinued.
Free Open Source Mac Windows Linux BSD
Fast motion First Person Shooter (FPS) First Person Shooter (FPS) Portable ... Shooting Add a feature

44 Like
Red Eclipse

Red Eclipse is a fun-filled new take on the first person arena shooter, built as a total conversion of Cube Engine 2, which lends itself toward a balanced gameplay, with...

Free Open Source Mac Windows Linux BSD Steam
First Person Shooter (FPS) Multi-Team CTF Multiplayer OPENGL ... Single player Add a feature

34 Like
Unvanquished

Unvanquished is a free, open-source first-person shooter combining real-time strategy elements with a futuristic, sci-fi setting. It is available for Windows, Linux, and...

Free Open Source Mac Windows Linux
First Person Shooter (FPS) Multiplayer RTS Sci-fi Add a feature

20 Like
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AssaultCube

AssaultCube is a free, multiplayer, first-person shooter game, based on the CUBE engine. Taking place in realistic environments, with fast, arcade gameplay, it's...
- Discontinued
  No more updates since Nov 2013 : http://assault.cubers.net/ (like Alien Arena, also noticed discontinued)
Free Mac Windows Linux PortableApps.com
First Person Shooter (FPS) Multiplayer Portable Single player Add a feature

30 Like
Urban Terror

Urban Terror started as a realism based "total conversion" mod for Quake III Arena. Nowadays, Urban Terror is played using the free, stand-alone, ioquake3...

Free Mac Windows Linux
First Person Shooter (FPS) Multiplayer Add a feature

30 Like