Before reading, be aware that this is a pretty stupid idea, but I would like to see it work.
So, as the title suggests, an port of GZDoom / Zandronum on Endless OS would be awesome.
I know there is FreeDOOM arleady installed, but with GZDoom / Zandronum you can mod DOOM, and play on multiplayer servers.
Keep in mind that users will need to provide their own WAD files.
And I am sure the devs of the respective source ports would be happy to collaborate.