This isn’t a difficult task and usually only involves copying a few files or folders into the source port directory before you can play. Many source ports exist as game engines only, which means you’ll need to bring your own data to play commercial games. And so far we’ve only touched on Doom! You May Need to Bring Your Own Data There are gigabytes of free content available for many of the source ports that exist today, including standalone projects like Freedoom which aims to recreate the first-person shooting experience from entirely free and original assets, to those that modify existing content like the bloodbath that is Brutal Doom. In addition to being able to play them natively on a variety of platforms (like ARM-based M1 and M2 Apple computers), many source ports introduce bug fixes, graphical enhancements, new rendering techniques, and more options for multiplayer gaming.

Playing these games (and others like them) using a source port is arguably the best way to enjoy them on modern hardware. Despite this, Doom (the game) is not open source in that you still need to purchase the game to play it (even with a source port). Id Software, the developer who created classics like Doom has open-sourced the source code to the majority of the engines used to power its games over the years.

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