ultimaaiera:

Delver is a project inspired by Notch’s ‘Prelude of the Chambered’, which aims to blend the mechanics of Ultima Underworld with the playability of a roguelike.

http://aiera.ultimacodex.com/2012/04/in-which-i-finally-get-around-to-mentioning-delver/

This project kind of intrigues me.  Back in the day, Ultima Underworld didn’t hold my attention the way it did some.  Because it didn’t follow the familiar formula and top-down perspective, it didn’t seem like an Ultima.  And I’ve never really played the rogues.  But I’ve often wished for a really great first-person dungeon crawl; this might become just the ticket.