Fuzzpilz have two Vst-plugins on his website, I have made custom skins for both of these plugs.
Charsiesis is a chorus/delay effect module and Oatmeal is 2-oscillator subtractive synthesizer, both are freeware and really top notch plugins.
"Custom" manual for Charsiesis is made by Sinkmusic.
Oatmeal skin - preview image
Charsiesis skin - preview image - preview image - preview image