People at xNURBS previously held senior R&D positions at PTC. After left PTC, more than a decade has been spent on the development of our variational surfacing kernel. In fact, ten years ago, established CAD companies (ISV) started to license our kernel and use it to develop applications for end users. Here is one of our kernel PR news related to nPowerSoftware in 2009 (now the kernel has a different name): http://www.digitaleng.news/de/integrityware-licenses-vbsplines-nurbs-library/.
Now after years of R&D, we eventually solve the key issues in surfacing and start to develop end-user applications. We invite users to judge if xNURBS is the most powerful and easiest-to-use NURBS software ever developed.