Amazing stuff! I really enjoyed reading it!
There are AwesomeBump that is written in QT and do not require .NET Framework and has code open.
Интересно, не понятно зачем, но круто. Я бы хотел поучаствовать в проекте
Have a look at a free set of smart materials for Substance Painter by Aleksey Kudryavtsev. The pack features four different surfaces that you can use for all kinds of projects.
Substance Painter smart materials pack:
Wood, Antique Nielloed Silver (added few alphas in ZBrush just for better representation), Ivory and Ice (faked by Emission channel).
Check out another pack of 20 materials from the artist for $5 here.