Top Alternatives to Counter-Strike (Series)

Unreal Tournament is a first-person shooter video game.

Call of Duty is a first-person shooter video game franchise. The series began on Microsoft Windows, and later expanded to consoles and handhelds.

Cube 2: Sauerbraten ("sour roast", or Sauer) is a cross-platform, Quake-like first-person shooter that runs on Microsoft Windows, Linux, FreeBSD and Mac OS X using OpenGL and SDL.

Urban Terror is a freeware multiplayer first-person shooter video game.

Nexuiz is a multiplayer first-person shooter. It is distributed under the GNU General Public License (GPLv2).

AssaultCube (ActionCube) is a free and open source software first-person shooter video game.

Tremulous is a free and open source team-based first-person shooter with real-time strategy elements.

Alien Arena is a fast, free FPS deathmatch game.

TrueCombat: Elite & CQB is a tactical-teamplay oriented, modern-world combat simulation game.

AU Modern FPS is a browser-based game.