Are games like Doom, Quake ect allowed to be listed here assuming one is using a source port to play them?
Topic on Talk:List of low-end games
Note that only native game versions for Windows, OS X and Linux are noted in this table, and some games incompatible with modern operating systems will be excluded.
Doesn't sound like it.
EDIT: On second though, this might be referring to avoiding emulation. I personally think putting source ports for games like you mentioned makes sense.