I've just been to your website and your controls look amazing!
I'm part of a large Open Source GIS Community: MapWindow GIS (www.mapwindow.org[^])
For the next version (v4.9) we not only want to rewrite the GUI but also restyle it.
It seems using your controls will do most of this tedious task
I'm not sure about your license but it seems we can use your controls. If we do I cannot guarantee you developing time but I can give you a lot of testing time: MapWindow GIS has a 10,000+ user-base.
I'm looking forward hearing from you if you are interested in this kind of collaboration.