FTime: Ftime 'seeks to make concrete use of Internet technology to provide a framework for musical collaboration across multiple sites on planet Earth'. Okay, but the last performance was in 2000, and the graphic score format is pretty delimiting.

Mouse Jam: A garden-variety mixing page where all you can do is control the volume and duration of preset musical elements, most of which are pretty mundane.

Muffled: This is an artist site for Double Muffled Dolphin, which features what he calls an Ambient Automat interface that is free to download and looks like fun to play with but also pretty outdated.

Sinth_mods: Okay, now we're getting somewhere. Granted, this isn't really interactive composition at all, but at least it works.

US Drumbox: A Java drum machine

QuantumPortal: Where you hope that every leap, will be the leap back home, and also, you can generate as much MIDI-cheese as you want. Still, this is the most well-developed site on the list so far.

Mushroom: A very cute aleatoric collage generator that uses Nixon samples.

Sounds of Shapes: Another synthesis engine, this time it's Java-based.

SSEYO: A software company that develops, among other things, generative music applications.