Mac Source Ports features native app builds of source ports of your favorite games for both Apple Silicon and Intel Macs, signed and notarized whenever possible.
Developer: id Software
Release Date: December 10, 1993
Source Code Release Date: December 23, 1997
You can't *not* have DOOM on a site like this. With its classic and low system requirements, DOOM famously runs on anything with a screen and a processor, so naturally it (still) runs on the Mac. The most active source port is GZDoom, which is ahead of the curve on having a Universal 2 app with M1 Mac support so we're just linking to it here. Be sure to check out their website for more info.
We've also linked to ZDoom, an older but discontinued predecessor to GZDoom, for those of you who want to run DOOM on an older PowerPC Mac.

Developer: id Software
Release Date: October 10, 1994
Source Code Release Date: December 23, 1997
The retail sequel to DOOM eschews episodes for one long campaign of levels. Adding new weapons and monsters, DOOM II delivers on its promise of more DOOM.

Developer: TeamTNT
Release Date: June 17, 1996
Source Code Release Date: December 23, 1997
Final DOOM was a retail product which contained two 32-level campaigns, TNT: Evilution and The Plutonia Experiment. It used the same weapon and feature set as DOOM II and the episodes were contracted out from the DOOM level editing community.

Developer: Raven Software
Release Date: December 23, 1994
Source Code Release Date: January 11, 1999
Running on the DOOM engine, Heretic went an entirely different direction with dark fantasy elements, interactive environments, and inventory items. Also sometimes you can fly.

Developer: Raven Software
Release Date: October 30, 1995
Source Code Release Date: January 11, 1999
The sequel to Heretic, also running on the DOOM, Hexen: Beyond Heretic builds on Heretic's foundation by adding selectable classes and a hub structure.

Developer: Rogue Software
Release Date: May 15, 1996
Source Code Release Date: December 12, 2014
Demonstrating the flexibility of the DOOM engine (or at least developers' willingness to try and use it everywhere), Strife is an RPG with FPS elements. If nothing else, it's a neat idea. One interesting side note is that the original source code for this game was lost, the support for this game was reverse engineered.

Developer: Digital Café
Release Date: 1996
Source Code Release Date: December 23, 1997
Legendary for being the first video game released in a cereal box (or at least the first good one), Chex Quest is a fantastic FPS game using the DOOM engine but eschewing the violence for cartoon zapping. Essentially a kid-friendly DOOM total conversion with new levels, this marketing tool has continued to entertain, especially if you have a kid who wants to play a retro first person shooter.
The first game in the series was released on a CD-ROM in boxes of Chex, the second game was available for download on Chex's website, and the third game was commissioned in 2008 (!). There's a reason why everyone from AVGN to John Oliver have commented on this game.
The WAD files are available for free here.

Developer: Flying Bear Entertainment
Release Date: August 31, 2001
Insaniquarium is a game where you feed fish. And fight aliens. And feed fish to other fish. And avoid electrocution. By now you either think this game is pointless or endlessly addictive. And if you think that sounds addictive you're not alone, since this game was downloaded 20 million times in five years.
Insaniquarium was later re-released in an enhanced version dubbed Insaniquarium Deluxe, which is the version you can still get off of Steam to this day, and the version that Insaniquarium Portable uses.

Developer: Cavedog Entertainment
Release Date: September 27, 1997
Total Annihilation is an RTS game with a cult following. Whereas other games in the genre focused on resource scarcity or micromanagement of units, it focused on resource streaming and large scale battles across bigger maps.
The game's designer, Chris Taylor, would go on to make spiritual sequels in the form of Supreme Commander amd Planetary Annihilation.

Developer: Bungie West
Release Date: 29 January 2001
The last game Bungie made before being absorbed by Microsoft and consumed with Halo, Oni is that game I barely remember but folks on my Discord desperately love. It's also never been released on digital distribution services, has been out of print for ages, and was the only product of the Bungie West offshoot.
Still, it is the subject of multiple reverse engineering attempts, the latest of which recreates the game for Apple Silicon.
In the anime-style game you play as a female protagonist aligned with the police force but learns that elements of her past are being hid from her, causing a quest of self-discovery.

Developer: Tom Kidd / Mac Source Ports
Release Date: February 23, 2022
Extractor is an app from Mac Source Ports that extracts files from GOG Windows-based installers. Think of it as a GUI version of innoextract.
Right now, Extractor does exactly two things: lists the files in an installer, and extracts the files from an installer. We hope to expand it in the future but for now it's a simple application.

Developer: Hard Light Productions
Release Date: February 11, 2024
Knossos.NET is a utility that aids in downloading and configuring the FreeSpace 2 Open Source Project, aids in configuring the content from a GOG installer or other location, and can even help with mod management and multiplayer support. Check it out if you want to play FreeSpace 2 with as little hassle as possible.
