a modern QuakeWorld client focused on competitive online play

First-person shooter game

Shoot and survive

Epic story-driven FPS running on the Build Engine

Classic arena first person shooter

Fast paced, first person strategy game

Game engine for Classic Doom

The Free and Fast Arena Shooter

The orb ponderer's arena first-person shooter

Top-down shooter action RPG

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

Free agile arena shooter

First-person shooter with cooperative in-game map editing

Free fast paced arena shooter

A Quake mod based on the retro shooter SPRAWL

Dhewm 3 is a Doom 3 GPL source port

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

Source port for Build engine games

Tank digging battle game

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

Modern cross-platform port of the Descent engine

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

Leading the way in newschool multiplayer Doom online

Open source first person shooter

EDuke32 is an awesome, free homebrew game engine

FPS aim trainer

Open source first person shooter

A modernization effort of DOOM-3-BFG

Open Source voxel shooter

Game engine for Return to Castle Wolfenstein