The VDK Official site
This is the toolkit where VDKBuilder is built upon.
VDK is a C++ binding of the famous GTK+ widget set library.

The GTK+ toolkit
Here you will find the GTK+ home page with lots of information about the GTK+ toolkit and links to several other related projects.

SCons: A software construction tool
SCons is an Open Source software construction tool—that is,
a next-generation build tool.

The Standard C++ Library
Documentation of the GNU Standard C++ Library can be found here