If you've not already Omnirizon, I highly recommend you submit your technical queries to the Google Group and/or the Roguetemple board...as there are technical minded folk there that would surely take a gander and weigh in.
I also forgot some earlier, oops. Furthermore then:
http://roguelikefiction.com/ Legerdemain Combines Roguelike with Advtenture game to a nifty result. Had an old school cluebook version of the game you could get awhile back, well made and in journal form sitting on my dresser---free in general though.
http://www.zincland.com/7drl/letterhunt/ Letterhunt is an older 7DRL project that falls into the "so nifty" category alluded to above. Conquer the alphabet in an entirely different manner all over again.
http://egoboo.sourceforge.net/ Egoboo is a long developed Roguelikeish thing that is graphical and has an interesting, if whimsical, style to it.
http://slashie.net/news.php Many interesting projects here, including the newfound Expedition and older projects that we all dream of further completion on like CastlevaniaRL
http://hokuto-no-rogue.sourceforge.net/ Hokuto no Rogue is something the classical 80's anime fans will immediately recognize and salivate over. Still early but the Java and graphical implementations are very promising and does some appropriate, yet nifty, things like locational damage targetting.
http://homepage3.nifty.com/rfish/index_e.html
http://elona.wikia.com/wiki/Elona_Wiki
Elona is a hyper feature packed graphical Roguelike that is potentially downright creepy depending on how one plays it. Perhaps the most outlandish Sandbox of a Roguelike out there yet.
http://www.freewebs.com/drussell/index.htm Feeling like some classics like never before? This man has you covered with a classic Rogue, graphical Rogue, graphical Hack(predecessor to Nethack), and various other projects.
http://scourge.wikia.com/wiki/S.C.O.U.R.G.E.
http://scourgeweb.org/tiki-index.php
SCOURGE, while the main site is down right now, is a graphical 3/4'ish perspective up and coming party based Roguelike that is bursting with ambition and graphical flare attempts. In dev for quite awhile now and chugging along thusly with their newfound wiki helping to keep it all together.
Hmm...that'll do until some other stuff comes to mind that I might've forgotten these times around.