[app4soft]

What about AzPainter?[0]

It's really cool image editor based on X11, that still is obscure competitor to GIMP and Krita ;-)

[0] https://github.com/Symbian9/azpainter

[leafo]

This is a great program, essentially PaintTool SAI recreated for Linux

[app4soft]

> recreated for Linux

Not only for Linux, but for FreeBSD/OpenBSD and Mac OS too![0]

[0] https://github.com/Symbian9/azpainter/wiki/Packaging-status