What a great and helpful guide you've written. Respect.
Just updated it!
Why didn't you share the URL to sign up in the article
An enthusiast stkopp has found a way to use a pack of ZBRush Orb Brushes by Michael Vicente in Blender. The method could be also applied to other brushes.
This is my transfer of popular brush pack from zbrush to blender. I did not make alphas on my own, but author gave all his brushes for free so, I guess, I could take them and use in blender. I tried to emulate this brushes as close as they work in zbrush.
This brushes was created by 3D Senior Environment Artist at Blizzard Entertainment (Michael Vicente aka ORB)
You can get the original brushes here.
The tutorial on how to install brushes: