AudioBox is an audio scripting language for Windows that allows you to develop VST effect and VSTi plugins in a simple way. It is based on the traditional model of unit generators (oscillators, filters, envelopes, noise generators, etc..) which can be connected together to form anything you want, from a chorus effect to an additive synth.

It main feature is "compile" the user scripts in native VST/VSTi format. It currently is in very beta stage, and does not have any documentation yet.