FabFilter

I've been using FabFilter plugins for a year or two, and I'm literally in love with this magnificent software. Recently I've started to develop my own plugins, and, searching for appropriate resources, I stopped on JUCE as a wrapping framework, and some pieces from Qt for designing GUI.
Since I'm mostly inspired by FabFilter plugins, I'd be very glad to know about any frameworks used in creating their plugins (if there are any, and it's not a development secret). This information would help me really much.
Thank you in advance!

Hi,

Actually, we don't use any third-party frameworks at all. We've built our plug-ins and interfaces from the ground up ourselves :-)

I think my respect for your work just grew by a very large quantity, a bit just as the mighty fear of imagining all the source code you have written.
Thanks for the reply!

Whoa!
I'd like to know more about this if possible. Did you guys also do the gpu acceleration?

Is there any "plugin developer tutorial" that your programers might recommend?

I ask because I know a bunch of c++ and I've wanted to apply it to music.

Anyways, awesome work!