Epic story-driven FPS running on the Build Engine

The Free and Fast Arena Shooter

Dhewm 3 is a Doom 3 GPL source port

EDuke32 is an awesome, free homebrew game engine

First-person shooter game

Open Source voxel shooter

Free agile arena shooter

Fast arcade first person shooter

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

Source port for Build engine games

Classic arena first person shooter

A modernization effort of DOOM-3-BFG

Aliens vs Humans, First Person Shooter game with elements of Real Time Strategy

Open Source voxel shooter

Free fast paced arena shooter

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

A Quake mod based on the retro shooter SPRAWL

a modern QuakeWorld client focused on competitive online play

A Doom II mod with weapons and mechanics inspired by Quake Champions

Fast paced, first person strategy game

Game engine for Classic Doom

Tank digging battle game

FPS aim trainer

Leading the way in newschool multiplayer Doom online

The orb ponderer's arena first-person shooter

Top-down shooter action RPG

Game engine for Return to Castle Wolfenstein

A Zandronum 3.0 fork with improved netcode, configurable movement and many small tweaks

ReC98 source port of the first Seihou Project game

Open source first person shooter