I know DND and Telengard are basically the same game by the same author and not fully roguelike games, but I think they have some similarities to roguelikes and are still quite fun.
Zyll is almost a combination of a roguelike with interactive fiction, though not as deep or complex as either genres. Still quite fun and innovative for its time.
MAG or Mike's Adventure Game is one of my personal favorite roguelikes when I want to get a quicker and simpler game in. It doesn't seem to get much fanfare though. I like it because it is still quite similar to the original Rogue which is still my favorite.
Anyone else enjoy/remember any of these games?