This project is a fancy frontend for NetHack sporting a full modern interface, including a 3D view! (along with a classic tiled view and an ASCII mode).
Too bad it is Mac only, but so far it looks interesting… albeit not much info is available due to its japanese nature (the website claims the game supports english though)
NetHack3D is a port for MacOSX (Cocoa) of nethack which is an RPG of traditional Unix. As for full 3D by OpenGL, various expansion is made. I support English and Japanese.
Transliteration: NetHack 3D is a MacOSX (Cocoa) port of NetHack, which is a traditional Unix RPG. It offers a 3D powered by OpenGL as well as many other expansions. It supports Engrish and Japanese
Further info at the official website