Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Placeit - Generate realistic product shots in seconds
GIMP - GIMP is a multiplatform photo manipulation tool.
Smartmockups - Create stunning product mockups, easily and online.