Toolboxes are integral part of the framework and are programmed using C++ and wxWidgets and by themselves can be a good candidate to be a stand-alone software.
However, the integration of toolboxes to the framework provides convenience of exporting and importing of data/variables from other working parts of the framework. This gives considerable flexibility to work especially with std library and data structures to do further work on the variable.
As shown in the figure, the toolboxes can be accessed via the "Home" ribbon page.
Image Processing Toolbox
Lua Scripting Toolbox