Alternatives to Nexuiz 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) FLOSS FOSS Gaming ... OPENGL Portable Real time collaboration Add a feature

77 Like
Counter-Strike

Fast-paced, multiplayer FPS game series where teams combat for objectives as terrorists or counter-terrorists.

Freemium Mac Windows Linux Steam Playstation ... Xbox
First Person Shooter (FPS) Gaming Multiplayer Works Offline ... Shooting Add a feature

127 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) Gaming Sci-fi Add a feature

89 Like
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) Gaming Multiplayer Portable ... Single player Add a feature

30 Like
Halo

Halo is a science fiction, first-person shooter video game series, that centers on an interstellar war between humanity and a theocratic alliance of aliens known as the...

Commercial Mac Windows Steam Xbox
First Person Shooter (FPS) Local multiplayer Multiplayer Sci-fi ... Single player Add a feature

16 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) Gaming Multiplayer Add a feature

31 Like
Alien Arena

Alien Arena is a free and opensource first-person shooter game that combines a 1950s-era sci-fi atmosphere with gameplay similar to...
- Discontinued
  The last update was released on September 6th, 2013.
Free Open Source Mac Windows Linux BSD
First Person Shooter (FPS) Multiplayer Sci-fi Shooting Add a feature

15 Like
Painkiller

The game is inspired by such classic titles as Quake and Doom, with the emphasis on killing large numbers of monsters. The game is divided into five chapters, each about...

Commercial Windows
First Person Shooter (FPS) Gaming Multiplayer Single player Add a feature

9 Like
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Nexuiz Classic

Nexuiz was originally developed by Lee Vermeulen and Forest ‘LordHavoc’ Hale, who started Alientrap in the summer of 2002. The goal of the project was to create a high...
- Discontinued
  Nexuiz is no longer developed. It's successor is https://alternativeto.net/software/xonotic/ , but last version of Nexuiz Classic, 2.5.2, released in 2009, can be still downloaded from the official website.
Free Open Source Mac Windows Linux
First Person Shooter (FPS) Gaming Real time collaboration Add a feature

27 Like
AU Modern FPS

A simple First Person Shooter game, based on Unity web player, ready to play on browser.

Free Web Unity Web Player
First Person Shooter (FPS) Shooting Web-Based Add a feature

10 Like