Game engine recreations and source ports/FPS

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Earlier id games

ReflectionHLE: Conservative source port for Catacomb 3D series and Wolfenstein 3D, as well as Keen Dreams.
ECWolf: Source port for Wolfenstein 3D with support for widescreen and high resolution, and modding features.

GZDOOM: The most popular Doom source port. Adds significant modding features and hardware rendering. Used by several commercial indie games.
Chocolate Doom: Conservative source port of Doom, strictly following the behavior and features of the original version, but for modern operating systems.
DSDA Doom: The successor to PrBoom+. Good accuracy to the original game through featurelevels, while at the same time supporting Boom and MBF21 extensions and (optional) hardware rendering. Popular with speedrunners.
Zandronum: The leading port for multiplayer Doom. Built on an older version of GZDoom.

The following ports are specific for Doom games on console

Doom 64 EX Plus: Updated fork of Kaiser's original Doom 64 EX. Adds new monsters and the ability to play the leaked alpha version of the game.
PsyDoom: A backport of Doom and Final Doom for the PS1.

EDuke32 and VoidSW: Duke Nukem 3D port with heavily extended CON scripting language. Used for the commercial game [Ion Fury]. The port VoidSW is for the game Shadow Warrior and is co-hosted with the EDuke32 repository. Has both the original software renderer as well as two hardware renderers (Polymost and Polymer)
NBlood, Rednukem and PCExhumed: Sister projects to EDuke32 hosting reverse engineered ports using the same backend. NBlood runs Blood and PCExhumed runs the DOS version of Powerslave. Rednukem is built on the original Atomic Edition source code for Duke Nukem 3D while also supporting Redneck Rampage, Redneck Rampage Rides Again and Duke Nukem 64.
Raze: Port of multiple Build engine games running on the GZDoom backend. Hardware rendering only.
BuildGDX: Port of multiple Build engine games, uses the GDX library for Java. Runs several games (Witchaven, TekWar, Legend of the Seven Paladins) not covered by the above ports.

DarkPlaces: Source port focusing on visually enhancing the original Quake. Used by Wrath: Aeon of Ruins.
Ironwail: High performance QuakeSpasm fork. Compatible with assets from 2021 remaster.
Q2 Pro: Multiplayer oriented port. Compatible with assets from 2023 remaster.