ORGANIZATIONS (ACADEMIC AND NON-ACADEMIC)

SIMC (in Italian)
SocietÓ Italiana Musica Contemporanea
CIDIM - COMITATO NAZIONALE ITALIANO MUSICA (in Italian)
Federazione CEMAT (in Italian)
American Composers Forum
Contemporary Music Centre, Ireland
Has an interesting "Opportunities section"
IRCAM, France
Sound and Music
The Composer's Site

MUSIC SOFTWARE RESOURCES

cSounds.com
The Csound Blog
The Csound Blog@Thumbuki
algorithmic.net: algorithmic composition resources
This site provides a comprehensive research resource for computer aided algorithmic music composition, including over one-thousand research listings, over one hundred system listings, cross referenced links to research, links to software downloads and documentation, and web-based tools for searching and filtering the complete lexicon.

AUDIO PLUGINS

KVR: Audio Plugin News, Reviews and Community
KVR Audio Plugin Resources, news and information about open standard audio plugins (virtual instruments and virtual effects) - VST and VSTi, Audio Units (AU), DirectX and DXi, LADSPA, DSSI, etc.
HITSQUAD.COM
Hitsquad Musician Network
DONTCRACK.COM
free and commercial audio software
GERSIC.COM
free audio plugin database
Music Studio Moderato, Recording Studio
Has a collection of free VST plugins

MUSICAL INSTRUMENTS, MAGAZINES

MercatinoMusicale.com | Strumenti musicali nuovi e usati (in Italian)
Mercatino Musicale - Annunci gratuiti per la compravendita di strumenti musicali nuovi e usati. Tutte le offerte dai migliori negozi di strumenti musicali. Cerca musicisti e gruppi con cui suonare, collaborazioni, scuole e lezioni di musica, sale di registrazione.
MusicRadar.com | Music gear reviews and news, Music equipment, Tuition
Get up to the minute news and reviews for all music makers
Audio Video & Music

ONLINE TOOLS/TOYS

inudge.net - Nudge
aM laboratory
Audiotool
Soundtoys