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
Check out a free pack that includes 9 unique custom brushes and a default airbrush by Marcin Rubinkowski.
Simply double click on the fill or add in brush panel. All brushes are unset, don’t forget to set brush projection or play with brush options to gain a proper effect.
You can combine brushes from other sets by Marcin to make your own outstanding set.
All brushes where originally made from photos the artist took in Europe, later edited, over-painted, finally tested by Marcin and a couple of other artists.