Top Alternatives to Doom (Series)

Half-Life is a series of first-person shooter video games that share a single science fiction alternate history.

Quake is a series of first-person shooter video games, starting with the game of the same name.

Xonotic is a free and open-source first-person shooter video game.

Borderlands is a series of action role-playing first-person shooter video games in a space western/science fantasy setting.

OpenArena is a free and open-source video game, it is first-person shooter (FPS) and a video game clone of Quake III Arena.

Alien Swarm is a freeware multiplayer top-down shooter video game.

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

Mafia is a series of action-adventure video games that are set in fictional locales modeled after American cities, and usually take place in a historical setting.

The Lord of the Rings Online is a massively multiplayer online role-playing game (MMORPG) for Microsoft Windows and OS X.

Dead Space is a series of horror games.

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.