I'm in the same boat. I often use http://kolourpaint.org/ http://kolourpaint.org/ in linux, and https://paintbrush.sourceforge.io/ https://paintbrush.sourceforg

I'm in the same boat. I often use http://kolourpaint.org/ http://kolourpaint.org/ in linux, and https://paintbrush.sourceforge.io/ https://paintbrush.sourceforge.io/ in OSX.