If you people like NetHack, by all means, you should try Slash'EM (which, IIRC, stands for Super Lots of Added Stuff Hack Extended Magic)!! It's an upgraded version of NetHack built on two of its variants, Slash and Nethack Extended Magic and, trust me, it's even better! You have new races, like the Vampire, the Doppleganger or the Werewolf, and new classes like the Yeoman or the Fire Mage. It has more items, artifacts, spells, special levels, special monsters, events and strange things to do, it has special techniques that your character can learn like going berserk or disarming an opponent. And... it's still supported, with a new version coming out about once in 2-3 months, which is great!
As an added bonus, to please everyone, it has the old ASCII graphics, but also three sets of graphic tiles (for those who prefer those) which are: the NetHack tiles, big better looking tiles and big isometric even better looking tiles.
So, what are you waiting for? Since I've found this game, I have never touched any other Rogue-like in existence.
www.slashem.org