Natural Selection 2 is a RTS/Shooter/Biter that you either play as marines or aliens, it is currently under development by Unknown Worlds.



Doom is described as '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 his way through the hordes of invading demons from Hell' and is a popular first-person shooter in the games category. There are more than 50 games similar to Doom for a variety of platforms, including Windows, Linux, Mac, Steam and Playstation apps. The best Doom alternative is Half-Life. It's not free, so if you're looking for a free alternative, you could try Xonotic or AssaultCube. Other Doom like games are Quake, Fallout, Borderlands and Prodeus.
Natural Selection 2 is a RTS/Shooter/Biter that you either play as marines or aliens, it is currently under development by Unknown Worlds.





dhewm 3 is a Doom 3 GPL source port, known to work on at least Windows, Linux, macOS and FreeBSD.






Anarch is the most popular Web-based alternative to Doom.




The first Lost Planet game takes place in the year known in the game as T.C. -80 on the fictional planet of E.D.N. III. After the Earth's conditions become too hostile for humans due to war, global warming and pollution, a fictional interstellar megacorporation named...




Jake2 is a Java 3D game engine. It is a port of the GPL’d Quake2 game engine from id Software. To use the Jake2 engine you need either the data files from the original game or from the demo version that is available for download from ftp://ftp.idsoftware.com.



Wrack: Exoverse is the follow-up to the 2014 first-person shooter Wrack. It was a very fast-paced, arcade-style game with heavy influences from classic shooters like Doom and Quake.

Digital Paint: Paintball 2 is a Paintball game that started out as a mod for quake 2 but then took on a life of its own as an open source fps game with a global player and clan management system.



Shadow Warrior Classic Redux is a remastering of the cult classic PC shooter featuring enhanced visuals and new expansion content.




First person shooter survival horror game. Alone in the middle of nowhere, find out what brought ruin to this abandoned ship and its inhuman inhabitants.




The Hammer of Thyrion project is a cross-platform source port effort of Raven Software's Hexen. Last updated 2018-06-06.



