Mac Source Ports

Developer: PopCap Games
Release Date: May 5, 2009

Plants vs. Zombies is an example of casual game perfection, from developer PopCap Games at their peak, pre-acquisition. Effectively a tower defense game without being a tower defense game, it has a difficulty curve so incredibly well done that at some point you're pulling off elaborate strategies without ever feeling like you're not ready for it. With an addicting amount of depth, additional mini-games once you finish the campaign, and no microtransactions or mismatched mechanics, it's a game that absolutely holds up.

It's also a game where I had no idea there was a modding community, let alone a nearly perfect reverse engineered source port nearly five years in the making. I honestly thought for a minute it was some sort of trick but no, PvZ Portable is a true reverse engineered port.

NOTE: While PvZ-Portable definitely works with Plants vs. Zombies: Game of the Year Edition, I'm not clear if it works with the regular (non-GOTY) edition. As of this writing the GOTY edition is the only version on Steam. As far as I can tell it does not work with the recent Plants vs. Zombies: Replanted edition.

Developer: Quetoo Team
Release Date: May 22, 2026

So this is interesting, I just stumbled on this randomly a few weeks back right after it was released, although it was apparently in the works for twenty years.

Quetoo is an open source project that's a combination of id Tech engines and technologies, incorporating every graphics technique the source port communities are known for, and recreating some of the classic maps of the Quake series without actually using any of its data.

The result is a purely community focused freeware arena shooter that can even be edited with modern tools like Trenchboom.
Definitely one to keep an eye on.

Developer: Maxis
Release Date: December 1, 1993

The 90's were a wild time for a lot of reasons, not the least of which was that we were obsessed with tacking the number "2000" onto everything. So instead of SimCity 2 we get SimCity 2000. And whereas the original game was something of a loveable mess, SimCity 2000 polished and went much further with the concept and shifted to an isometric view.

The OpenSC2K project, interestingly, is not an attempt to reverse engineer the code so much as it's a playable recreation in Godot. It went dormant for several years and was recently revived.

So get ready to feel like you just came home with the floppies from Babbage's and prepare yourself for a fun city building experience only slightly marred by a frustrating water pipe interface.

Developer: Chris Sawyer
Release Date: October 15, 2002

Another game from the mind of Chris Sawyer, RollerCoaster Tycoon 2 shares the same pixel art style and hardcore interface as his other games.

  Buy RollerCoaster Tycoon 2 on GOG.com

  Buy RollerCoaster Tycoon 2 on the Humble Store

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.

  Buy Total Annihilation on GOG.com

  Buy Total Annihilation on the Humble Store

Developer: Splash Damage
Release Date: May 29, 2003
Source Code Release Date: August 12, 2010

The story goes that Activision commissioned an expansion pack for Return to Castle Wolfenstein, which like the base game would offer both a single and multiplayer campaign, each assigned to different developers. For whatever reason, the single player campaign did not meet expectations while the multiplayer component was coming along nicely so the decision was made to cancel the expansion pack but release the multiplayer portion standalone for free as Wolfenstein: Enemy Territory.

Although we have numerous options today, in 2003 this was an almost unheard of phenomenon: a free game with no strings attached and whose tech for mods and map making were already in use by the community. In 2010, the source code for the full game was released and the ET: Legacy project has been actively maintaining for years now, with an enthusiastic player base continuing to populate servers two decades later.

NOTE: due to the nature of compiled mods, not all servers may be playable for non-Windows players. Look for servers running the "Legacy" mod for the best chance of connection success.

  Buy Wolfenstein: Enemy Territory on GOG.com

Developer: id Software
Release Date: December 9, 1997
Source Code Release Date: December 22, 2001

Quake II is a first-person shooter, the second in the Quake series. Yamagi Quake2 is the most mature and advanced port actively being maintained.

And just so the PC gamers don't have all the fun, there is now a port from Night Sight Productions of the Quake II: RTX project to Metal.

  Buy Quake II on GOG.com

  Buy Quake II on the Humble Store

Developer: LucasArts
Release Date: July 10, 1994

From a time when it seemed LucasArts could do no wrong, Star Wars: TIE Fighter is a space simulation game that flips the script on the original Star Wars trilogy, putting you in the role of a TIE Fighter pilot for the Galactic Empire. You must complete a series of missions that involve defending the Empire's interests, hunting down Rebel Alliance targets, and engaging in tense dogfights with enemy ships. The game features a deep and engaging storyline, a variety of ship upgrades and weapons, and detailed graphics and sound effects that bring the Star Wars universe to life. With its challenging gameplay, complex strategy, and innovative features, Star Wars: TIE Fighter is another true classic of the space simulation genre.

  Buy Star Wars: TIE Fighter on GOG.com

  Buy Star Wars: TIE Fighter on the Humble Store

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: 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.