The venerable Phoronix pointed out that Robert Beckebans has adopted the open source code to Doom 3 to support the recent revamped retail release, Doom 3: BFG, on Linux. Robert’s fork can be found here.
Phoronix: Doom 3 BFG On Linux Is Still An Active Pet Project
Last week marked the one year anniversary of id Software open-sourcing their Doom 3 BFG engine changes. While they didn't release a Linux client for Doom 3: BFG Edition, a small group of open-source developers did a community Linux version via the RBDOOM-3-BFG project.
Applies to Ultimate DOOM, DOOM 2, Heretic and Hexen: all of which can be played with the same source ports.
I really, really wanted to revisit doom. Now, I was a huge DOOM fan from the time it was announced (yes, that's announced, not released) to about 10 years after that. I played through Hell Revealed on Ultra-Violent, and if you're a DOOM fan, you'll know what that means.