Since I didn't see it mentioned, my multiplatform (Java based) alternative to Paint.net is Pixelitor, https://pixelitor.sourceforge.io/ https://pixelitor.source

Since I didn't see it mentioned, my multiplatform (Java based) alternative to Paint.net is Pixelitor, https://pixelitor.sourceforge.io/ https://pixelitor.sourceforge.io/ Something in between MS Paint - Paint.net I think. I also use XPaint; it's quite capable but the interface is very different, too much deviated from usual GUI apps.