The NetHack Dungeon

Hall of fame, tips and tricks, spoilers, and other files for the 3.2 release.
http://home.swipnet.se/~w-73296/

JNetHack

Version 3.2.2, Japanized. Features a new class, source, and executables.
http://www.jnethack.org/

Sascha's and Ralph's NetHack site

Includes spoilers, hints, utility programs, and a list of public NetHack servers
http://www.nethack.de/

NetHack

Official site. News, guides, links, and both source and executables for several platforms.
http://www.nethack.org/

rec.games.roguelike.nethack Cretins Advisory

Dedicated to keeping the newsgroup clean of "spammers, d00dz and things like" that.
http://www.beastwithin.org/users/wwwwolf/games/nethack/

The NetHack Index

Annotated directory of spoilers, variants, patches, utilities, servers, reviews, and other useful information.
http://www.nicolaas.net/erebus/

The NetHack Home Page

Unofficial mirror site. Spoilers, source, executables, and utilities.
http://roguelikes.sauceforge.net/pub/nethack/

Yahoo! Groups - thenethacklair

Gameplay discussion group. Free membership required to participate.
http://games.groups.yahoo.com/group/thenethacklair/

rec.games.roguelike.nethack FAQ

Frequently asked questions about the game, its Usenet newsgroup, and related topics.
http://www.spod-central.org/~psmith/nh/rgrn-FAQ.txt

NetHack Stuff

Dictionary, world map, and play statistics.
http://www.nethack.net/