I spent most time on both Larn and Hack (don knellers original hack pc 1.03 port)
Xenocide. Definitely Xenocide
nethack, by many orders of magnitude. After that comes CalcRogue (a TI-89 roguelike).
No love for POWDER and Rogue so far :(
first place: nethack (never ascended)second place: doomrl (pwned):-)
DoomRL :D...and POWDER as a close second.
Moria followed closely by Angband V
Angband / Moria
Linley's Dungeon Crawl
ADOM, all the way.
Dungeon Crawl Stone Soup and on the Nintendo DS
Overall I have played more NetHack, I've been playing that since Andries Brouwer's early DOS Hacks. But if I fire up a Roguelike these days I'll almost always play Crawl or DoomRL.
TOME followed by Crawl
nethack/crawl stone soup
Moria until I found ADOM, then ADOM by such a margin that no game will probably ever be able to compete.
Tampered around with Moria, Rogue, Nethack, Angbland, ToME.. Till I discovered ADOM. ADOM felt alot more meaningful.. I love how it is a complete WORLD to explore. By far ADOM. (Although lately I've played lots of 'Crawl Stone Soup')
Im surprised that POWDER is so low still, the only reason I didnt select it myself was because I definately played so more much Nethack back in the day.
Omega for years and years... Crawl is fast catching up with it, though. Spent a while on Angband, but not as many hours.
Crawl followed by TOME