Shoot and survive

Free fast paced arena shooter

Modern cross-platform port of the Descent engine

a modern QuakeWorld client focused on competitive online play

A modernization effort of DOOM-3-BFG

Open Source voxel shooter

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

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

Leading the way in newschool multiplayer Doom online

Epic story-driven FPS running on the Build Engine

Game engine for Classic Doom

Le jeu de tir Arena-shooter libre et rapide

First-person shooter game

Open source first person shooter

The orb ponderer's arena first-person shooter

Jeu de stratégie frénétique à la première personne

First-person shooter with cooperative in-game map editing

FPS aim trainer

dhewm 3 is a Doom 3 GPL source port

Classic arena first person shooter

EDuke32 is an awesome, free homebrew game engine

Free agile arena shooter

Tank digging battle game

Game engine for Return to Castle Wolfenstein

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

Source port for Build engine games

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

Open source first person shooter

Top-down shooter action RPG

A Quake mod based on the retro shooter SPRAWL