The lang is GERMAN but to change to ENGLISH open the 'language.txt' & change the '1' to a '2' and save...
This does ALOT & this GIF just shows maybe half the dialogs-

There is an undo & if you go back to a dialog it stays as you left it so you can redo say using a different blend mode as blend modes can be used with fills & such not just manual painting...
Can export in many types even OBJ & DXF as well as image...
Meshes kinda heavy this just one brush stroke over 100,000 faces...

Only thing I found wrong was some dialogs 'stick' & won't close if they had just done CPU intensive computations...But you can minimize them, they go away when closed app...
I think you can go to a 2K rez, nothing wrong with that...
No info on the site so here is direct link-
https://web.archive.org/web/20060620233 ... abrush.zip