Modern cross-platform port of the Descent engine

Epic story-driven FPS running on the Build Engine

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

A modernization effort of DOOM-3-BFG

The Free and Fast Arena Shooter

Open source first person shooter

First-person shooter with cooperative in-game map editing

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

Fast paced, first person strategy game

FPS aim trainer

EDuke32 is an awesome, free homebrew game engine

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

Classic arena first person shooter

Source port for Build engine games

Open source first person shooter

Dhewm 3 is a Doom 3 GPL source port

Game engine for Return to Castle Wolfenstein

Top-down shooter action RPG

ReC98 source port of the first Seihou Project game

Leading the way in newschool multiplayer Doom online

Tank digging battle game

The orb ponderer's arena first-person shooter

a modern QuakeWorld client focused on competitive online play

A Quake mod based on the retro shooter SPRAWL

First-person shooter game

Free fast paced arena shooter

Free agile arena shooter

Game engine for Classic Doom

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

Shoot and survive