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It really is amazing for open source software. So many little tricks to it that have my jaw like :O when doing this one I wish I have only known about rotating the canvas. There was a few times I had to twist oddly to control a stroke in an odd location on the tablet. At least I know now.

I use it for professional jobs. Inkscape and Krita are the backbone of my digital works.

Oh I have not heard about Inkscape, I seen David Revoy suggest Azdrawing for line art but after downloading that it was feeling a bit outdated. After looking at Inkscape this seems much better for line drawing, thanks for the tip!