Aleph One is a free open-source FPS engine based on Marathon 2.  Aleph One (FKA Marathon Open Source Project) is a project that started in the year 2000 when Bungie released the source code for Marathon rigth before Microsoft acquired...

zDoom is a source port of Doom and Doom II that is considered very advanced. It supports Boom's editing extensions, plus all of the extensions made in the version of the Doom engine used in Hexen: Beyond Heretic, as well as...

Mac DooM Legacy v1.32b1 (MDL) is the final port available for the classic PPC Mac OS (9.2.2 & earlier) version of DooM Legacy. It uses a modernized custom DooM engine built on id's original code. This version supports OpenGL...

ROTT, or "Rise of the Triad", is a first-person shooter for the PC, dating back to 1995, with some very innovative features and still enjoyable to play today, despite its graphics engine which is largely based on Wolfenstein 3D. As a 2002...

This is one of the most popular Doom source ports. It is available for DOS, Windows, Linux and Mac OS X, and should build on any POSIX platform which supports SDL. It enhances Doom with things like TCP/IP networking, OpenGL renderer, Heretic support...

This is a compilation of the latest Pangea Software ports released on Iliyas Jorio's GitHub page as of winter, 2024. If you'd like to support the development of Pangea game ports, feel free to visit https://jorio.itch.io and name your own...

Heretic is a mid 90's 3D computer game, based on the Doom engine, released for DOS in 1994.  It was never officially released for Macintosh, although Hexen, Heretic's sequel, was. This unofficial 1999 port by Brad Oliver lets you...

REminiscence is a rewrite of the engine used in the game Flashback from Delphine Software. This program is designed as a cross-platform replacement for the original executable. The game data files (DOS, PC-CD, Amiga, Macintosh) are...

EDuke32 is an awesome, free homebrew game engine and source port of the classic PC first person shooter Duke Nukem 3D— Duke3D for short—to Windows, Linux, macOS, FreeBSD, several handhelds, your family...

Chocolate Doom aims to accurately reproduce the original DOS version of Doom and other games based on the Doom engine in a form that can be run on modern computers. Originally, Chocolate Doom was only a Doom source port. The project now includes...

Chocolate Duke Nukem 3D is the equivalent of Chocolate Doom. A port that: Remains as faithful as possible to the original source code. Portable and compiling in one click on Windows, OS X and Linux. Aimed at education,...

Arx Libertatis is an improved, cross-platform and open source engine for Arx Fatalis, a 2002 first-person role-playing game / dungeon crawler / immersive sim developed by Arkane Studios.  - (Arx-Libertatis.org)

An open-source port of Prince of Persia, based on the disassembly of the DOS version, extended with new features.  - (GitHub page)

Doom64EX is a reverse-engineering project aimed to recreate Doom64 as close as possible with additional modding features.  - (GitHub page)

Odamex is a free, cross-platform (Mac, Windows, Linux) modification of the Doom engine that allows players to easily join servers dedicated to playing Doom online.  - (Odamex.net) *This is an unofficial port by thedoctor45 for Mac OS X...

Yamagi Quake II is an alternative client for id Softwares Quake II. Our goal is to provide the best Quake II experience possible, we strive to preserve the game play as it was back in 1997. Thus we aim mostly for bug fixes, stability and gentle...