An interesting little Roguelike game for MS-DOS, written by Sami Maaranen and Erkka Lehmus.
URW's background mythology is based on Finnish mythology, Kalevala in particular, but there are differences.
The cool thing about it is that there's a good line of sight system and the places you can see are shown on the screen. Also, there's a detailed skill system and very detailed damage system. The game RPG mechanics are pretty detailed, perharps even too detailed for a game like this.
I might also say that the earlier versions I played had some amusing mistranslations =)
Also, the graphics found in the current version are better than on stock Nethack, even when the game probably isn't as in-depth as Nethack.
The game is distributed as shareware. Home page, as of writing: http://www.jmp.fi/~smaarane/urw.html