Semantic Audio Feature Extraction Plug-ins
To build VSTs you will need the SDK, avaliable here. http://www.steinberg.net/en/company/developer.html
To build AUs you will need the SDK, avaliable here. https://developer.apple.com/library/mac/samplecode/CoreAudioUtilityClasses/Introduction/Intro.html
This project would be nothing if it weren't for JUCE. https://github.com/julianstorer/JUCE
The reverb plug-in uses Martin Eastwood's fantastic MVerb. https://github.com/martineastwood/mverb
All the audio feature extraction is done using LibXtract. https://github.com/jamiebullock/LibXtract
The JUCE LV2 wrapper is part of DISTRHO. https://github.com/DISTRHO/DISTRHO