OpenArena is described as 'community-produced deathmatch FPS based on GPL idTech3 technology'. There are more than 25 games similar to OpenArena for a variety of platforms, including Windows, Linux, Mac, Steam and BSD. The best alternative is Xonotic, which is both free and Open Source. Other OpenArena like games are Unreal Tournament (Free, Open Source), Quake (Paid), Doom (Paid) and Overwatch (Paid).
- 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 must fight... Represent entire series of Doom games including Doom , Doom II: Hell on Earth, Final Doom, Doom 64, Doom 3, Doom (2016), Doom Eternal. View 56 alternatives to Doom
- Paid • Proprietary
- Nintendo Switch Online
- 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 addictive and fun!. View 59 alternatives to AssaultCube
No more updates since Nov 2013 : http://assault.cubers.net/ (like Alien Arena, also noticed discontinued)
- Free • Proprietary