KievII
KievII is a GUI and audio/DSP library written in Javascript that aims to help develop audio web applications.
Main site is here.
KievII documentation can be found here.
Look at a working demo [here] (https://developer.mozilla.org/en-US/demos/detail/voron).
You can find a discussion group for developers here.
You can follow KievII or its author on Twitter.
If you are so cool to contribute to KievII with money (open donation), here's a Paypal link and a Pledgie link for that.