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RogueBasin
http://roguebasin.t-o-m-e.net/index.php/Main_Page
Genre-specific wiki.
Roguelike Graveyard
http://www.graveyard.roguelikedevelopment.org/
Collection of unmaintained titles, summarized with screenshots, source, and executables.
The Valley: A Classic Reborn
http://www.classicgaming.com/studio2/valley/valley.htm
Background and MS-DOS rewrite. Also offers MS-DOS rewrite of The Tomb of Drewan.