For those that are a bit obsessed if not a lot obsessed with Alien themed Doom WADs, here's another one that uses the ZDoom source port:Foxtrot UniformDownload was dead, but wolfman re-uploaded it
Don't thank me, thank wolfman for re-uploading this mod.
I'm still looking into any other Alien or Predator Themed resources that have been out in the past 5-10 years specifically anything made or updated for any modern Source ports, and will add them here on this thread if I find more. Many of them did seem to have been foxed or abandoned unfortunately. (I'm talking about Tragos2d, since his site and Alien themed Doom mod project appears to be dead)