I've been playing these games for years, but thought I would recommend a few really good Rogue-likes for people that are into the genre.

ADOM - this is a REALLY in-depth fantasy RPG...worlds more involved and complex than any other game out there. (do a websearch for this one)


DOOMRL - DOOM done as a Rogue-like...it's surprisingly good and actually much more intense than the actual game it's based on.  (from chaosforge.org)

AliensRL - it's still in beta, but this is a Rogue-like based on the Aliens universe.  VERY suspensful, EXTREMELY difficult. (also from chaosforge.org)