Allsound

A Slashdot-styled news and discussion forum covering the gamut of experimental, fringe and avant-garde music and sound art. Updated daily.
http://www.allsound.org/

Musings

A resource for non-standard music, such as free improvisation, out-there jazz, composition, and electro-acoustics. Reviews, MP3s, searchable archives and excellent connections to the rest of the world.
http://www.geocities.com/SoHo/Square/6100/

Zu Casa

A laboratory for online exhibition and performance of improvised and experimental music, artist film and video, and net art.
http://www.zucasa.com/

NoiseIndex

NYC industrial, experimental, and noise resource, with calendar, reviews, photos, artist profiles, and music clips. Also with information on DJ going by the same name, specializing in noise, industrial, experimental, power electronics, dark ambient music.
http://www.noiseindex.com/

Insine

A space where you can listen to and download music from new artists and labels in the experimetal/noise/electronica scene.
http://www.insine.net/

OddMusic.com

Focused on unusual, experimental and ethnic music, such as music created in unusual ways or with unusual instruments. With sound clips, pictures of instruments, and links to related sites.
http://www.oddmusic.com/

NOMUSIC

An audio art gallery with several exhibits, and a call for entries.
http://www.nomusic.org/

The Deep Listening Catalog

The main site for Pauline Oliveros' Deep Listening Band and their record label, which includes such composers as Phil Niblock and Malcolm Goldstein. Experimental, avant-garde and minimalist music.
http://www.deeplistening.org/dlc/index.html

L'entrepot

A resource center for unconventional tunes, especially electronic, experimental, self-willed pop and rock, lo-fi, and post rock. Reviews, interviews and links.
http://users.skynet.be/entrepot/

European Free Improvisation

Large resource with profiles and links to articles and sites on non-idiomatic improvisational music, artists, and related independent labels.
http://www.shef.ac.uk/misc/rec/ps/efi/

The History of Experimental Music in Northern California

An extensive archive of information about experimental music from the 50s through the present, including artists, composers, groups, labels and articles.
http://o-art.org/history/

Mother Tongue Projects

Group developing various sound and musical productions as well as new media events and live performances, striving to bring together tradition and research, classicism and eclectism.
http://www.mothertongueprojects.com/

Livingroom.org

Forum for experimental music, new artistic ideas, performance art, multimedia performance, live art, improvisation and avant garde creative endeavors.
http://www.livingroom.org/

NoiseWeb

A site for dark, ambient and experimental noise and sounds, with event listings, articles and interviews, and links to related sites.
http://noiseweb.com/