GNU Image Manipulation Program (GIMP) is the longtime open-source photo editing alternative to Adobe’s category-leading Photoshop. It includes many powerful Photoshop-like capabilities, such as layers ...

UPDATE 03/13/2023: This plugin is now natively part of Krita as of Krita 5.0. I will keep this code here for reference, but you don't need to install this plugin any longer to get this functionality.

Image editing with reasoning — tell it "make this look like a watercolor painting, but keep the composition" and it thinks about what that means before editing.