Wow.
Apparently, you've been able to download Bungie's first 3 FPSes for free for the past 17 years
"Did you know that Halo and Destiny creator Bungie's classic FPS trilogy, Marathon, has been free and open source since 2005? I sure didn't when I shelled out cash for them on the Xbox Live Arcade in 2008 like some kind of chump!
We have the
Aleph One(opens in new tab) open source engine to thank for Marathon with no money down. Similar to how id's openness with Doom allowed modding-friendly source ports like
(G)ZDoom(opens in new tab), Bungie released the source code for the Marathon Trilogy back in 2000, facilitating the creation of Aleph One.
In an added treat, Bungie allowed free distribution of the official Marathon campaigns themselves just five years later. If you want to access Doom's foundational campaigns or phenomenal modding community, you're still going to need a paid copy of one of the game's many releases."
Apparently, you've been able to download Bungie's first 3 FPSes for free for the past 17 years | PC Gamer
Aleph One - Marathon Open Source (lhowon.org)
Link to games here^