The Free and Fast Arena Shooter

Game engine for Classic Doom

Ultra fast paced arena FPS

Story-driven FPS inspired by WWII shooters from the 90's and early 2000's

Hardcore 3D space scroll-shooter with spaceship upgrade possibilities

Fast paced, arcade-style, top-scrolling space shooter

EDuke32 is an awesome, free homebrew game engine

Dark 2D side-scrolling platform game

Preset-oriented graphical launcher of various ported Doom engines (an alternative to ZDL)

First-person shooter based on the Doom engine

Limit-removing enhanced-resolution Doom source port

Survival horror set on a remote island known as Fort Oasis

Epic story-driven FPS running on the Build Engine

Fast paced, first person strategy game

First-person shooter based on the Doom engine

Conservative source port

Cosmic horror first-person shooter

Leading the way in newschool multiplayer Doom online

A modern port of the original Quake engine

Yamagi Quake II is an alternative client for id Software's Quake II

Open source first person shooter

Fast, faithful Classic DOOM action — solo or online

dhewm 3 is a Doom 3 GPL source port

Source port for Build engine games

A space 2D shooter game

Survival horror set on a remote island known as Fort Oasis

A modern cross‑platform port of “STAR WARS™: Dark Forces” with mod support

Open source first person shooter

A modernized source port of Hexen II

Satisfying monster shooter