What follows is not intended to be comprehensive:
some of those listed below do a far better job in this respect. First of all there's
a list of what I consider to be links directly related to free improvisation; this
is followed by a much briefer listing of more general jazz links.
Free improvisation links
Avantart free and new music including Peter Kowald, Ned Rothenberg, Dror Feiler, Sergej Kuryokhin, Jim Meneses and Sainkho Namtchylak