General

European Free Improvisation
A general list of practitioners of the art, lots of piccies and audio, lots of info, a fair who's who of European Free Improvisors. Like it says.

Free Jazz Discussion Page
Like it says, a discussion of Free Jazz - read and contribute

Jazz Services
The UK's promoter of the artform. Loadsa links, directories of people etc etc

European Jazz Network
Pretty much as it sounds, whole bunch of interesting stuff from the continent

Musicians

Bob Drake
Musician, artist and photographer of cemetaries

Bret Hart
Guitarist out of North Carolina. Check the Instrumentales Duet series, and many other fine recordings here...

Ken Hyder
Fae Dundee - London based drummer, works w/Tim Hodkinson, Maggie Nicols - his band Talisker bridged the gap between free music and scottish folk, and he once did an album w/Dick Goughan, which is about as good as a CV gets, in my opinion...

Kaffe Mathews
Generally marvellous violinist and sound manipulator 

Deep Listening Institute
All you might want to know about Pauline Oliveros and collaborators.

Paul Hession
banging the big soft drum set in Leeds, UK

Caroline Kraabel
Musings on Life and Sound

Anthony Donovan
Info on his artworks and the Murmurists

Zines

Perfect Sound Forever
Online 'zine

Experimental Musical Instruments
Site of the american mag of the same name - the title more or less tells you everything, ie it's about unusual instruments, so if that's what you want, this is where it is...

The Wire
UK mag, not much improv coverage these days.

Labels

Leo Records
Great label. Tell them we said hi...

Bruce's Fingers
Simon Fell, operating since 1983, important catalogue, you oughta know about it.

Potlatch
French improv label

Babel
Billy Jenkins and cohorts up to the usual high jinks

Cadence
Out of NYC - Cadence is fairly straight ahead, also home to CIMP records, very purist improv label.

Rastascan
Improv and cutting edge from the West Coast (of the US, that is, rather than Conway)

Cuneiform
US label, lotsa interesting stuff.

Discus
Step forward, Martin Archer and his 'adventurous label', outta Sheffield.

Emanem
Martin Davidson's London based label

Recommended/ReR Megacorp
Chris Cutler's home to all that is wonderful

Materiali Sonori
eclectic selection from Italy's finest

Aumfidelity
"if you are looking for human-organized sounds to potentially tranform you, your search here has yielded a treasure"

Organisations

London Musicians Collective
London is a port in the South of England.

Manchester Jazz Festival
promote throughout the year, as well as the fez itself, in June

2-13 Club
London, Berlin and now Greece - CD's and live promotions from the afternoon musicians.

FRIM
Wassat, then? it's the Swedish Association for Free Improvised Music