was released to the public back in Sep, 2014, just in case anyone was interested.
What is it?
It's the Windows 7+ version of the very useful nlite
(for XP) that you can use to customise your Windows installation media.
NTLite is available in both free and paid versions with the paid versions offering extras like Live-install Modification and Portable operation (if you go for the Business license).
Here is a list of the basic differences between free/licensed (Commercial license available under Professional/Business):