Yeah, it's a personal favorite of mine from that era. But god damn is it hard (cheap AI, mostly).
There's a modern homebrew total conversion that's being worked on right now.. I forgot what it's called, but I believe it's almost done (if not done already). It's going to be available on the PC and Dreamcast, maybe other platforms. New game, but many of the same textures and sprites are being used on top of a lot of new things.
Dreamcast? link? I will have to get this. Quake on my dreamcast looks great, I would love to see this with updated graphics