GIMP 2.10.28 features all of the usual stuff like bug fixes and performance adjustments mainly aimed at Windows users.
Darktable has a bit of a learning curve, but in its latest update to 3.6, it’s easier to use that it ever was.
Do you want to compress your images before uploading them online? Meet YOGA.
Inkscape 1.1 released with huge set of improvements. It's a free vector graphics editor used to create vector images in SVG format.
Drawing is a free basic image editor for Linux. It is similar to Microsoft Paint, but aiming at the GNOME desktop.