Alternatives to Combat Arms for Mac 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
Battlefield

Battlefield is a series of first-person shooter video games that started out on Microsoft Windows and OS X with its debut video game, Battlefield 1942, which was...

Commercial Mac Windows iPhone iPad Origin ... Playstation Xbox
First Person Shooter (FPS) Massive Multiplayer Multiplayer Shooting Add a feature

83 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) Gaming Portable ... Shooting Add a feature

44 Like
Borderlands

Borderlands is a first-person shooter mixed with role-playing game (experience, specializations) that takes you to a mysterious planet, looking like a futuristic Wild...

Commercial $ $ $ Mac Windows Linux Steam Playstation ... Nintendo Switch Xbox
First Person Shooter (FPS) Gaming Multiplayer Shooting ... Single player Add a feature

52 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
Mafia

Mafia is a series of action-adventure video games developed by 2K Czech (formerly Illusion Softworks) with the third installment by Hangar 13, and published by 2K Games....

Commercial Mac Windows Steam Playstation Xbox
Gaming Shooting Single player Third person perspective Add a feature

24 Like
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OpenArena

OpenArena is a community-produced deathmatch FPS based on GPL idTech3 technology. There are many game types supported including Free For All, Capture The Flag...
- Discontinued
  Development is not stopped but last version, 0.8.8, was released in February 2012.
Free Open Source Mac Windows Linux
First Person Shooter (FPS) Free to play Multiplayer Add a feature

32 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