hi,

Try to flip a Selection (vert/horz.) and you stand already on the border of this tool.
(I know there is a plugin for that!)

I use paint.net as fast imageviewer and for quick changes.

Gimp is mighty and I use it in most cases.
But the best for Textureworks is DeepPaint2D (free but a little outdated).
I wish that gimp had such brushes like DP2D.


,gri