plugins

[Mo Facta]

If you want to get into building plugins, Synthmaker might be a good place to start. Many of the good free VSTs are made with Synthmaker.

I don't have any experience with it, but I'm sure you can find some tutorials. There might be some on their site:

SynthMaker - Modular VST and DSP Visual Programming Environment

Cheers

Ps. You can get DSP code from musicdsp.org:

http://musicdsp.org