[npteljes]

Have you tried Pinta? Filled the niche for me after switching to Linux.

[pndy]

Pinta uses an older Paint.Net code - https://github.com/PintaProject/Pinta

[mananaysiempre]

Apparently the author was unhappy with someone re-releasing the software while erasing the original credits (multiple times?): <https://stackoverflow.com/a/1693549>. Not sure why hiding the source code would help much, but oh well.

[Zababa]

Pinta crashes very frequently for me, usually after 2/3 operations.

[pizza234]

I did, and unfortunately it's usable only for extremely basic cases.

Images of a few megapixels will cause it to crash or hang on selection. Happened so many times that I am forced to use GIMP.