Blender Toolkit!

Hope the following isn’t off-topic out here, if it is, I apologize and request being pointed in the right direction.

Just the way GIMP had it’s own toolkit which morphed into GTK, is there any toolkit being used by Blender?
If yes, where can I find more information about it?

I am leading a project to build a GNU/Linux distribution specifically targetted towards CGI based work using Blender.
Would prefer to have a uniform look-n-feel.

There are plenty of OpenGL based GUI libraries that will give you an idea.
https://www.google.gr/search?q=sdl+gui+library&espv=2&biw=1574&bih=945&source=lnms&tbm=isch&sa=X&ei=mPhtVJnBGo6zabuvgpgC&ved=0CAYQ_AUoAQ

However I don’t know what the cost is if you try to detach the GUI of Blender, so you might try to modify another standalone library to mimic Blender look and feel.

I’m working on a UI engine based on Blender and inspired by the BGE (see signature - Flow). It’s Linux only since its features are only possible with X/Wayland. I’m planning on using it to extend Blender’s UI in the third dimension and for other input methods. It might be related to what you’re looking for.