Angband

Variant. Comparative overview, changelog, source, and executables for multiple platforms.

Discworld variant. Overview, source, and Windows executable.

Anime-themed variant. News, changelog, FAQ, source, and executables for a variety of platforms.

Official site, with downloads, news, documentation, contact information, and resources for developers.

Official development area, with bug tracking, news, source and executables, and mailing lists.