free image editing software Windows

Krita

Krita is an image editing application, but before you dismiss this as just another GIMP knockoff, it isn’t. While it has all the basic tools you’d expect, it also comes with several features that make image manipulation and photo editing easier such as multiple masks per layer, color history, clone layers and more.

RIOT

RIOT is a free image optimization tool for Windows. Created by Lucian Sabo, the program has an easy to use interface so you can easily compare an image before and after optimization. Another advantage of this program is that it is light and it can be integrated with GIMP XnView and IrfanView.