Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
GIMP - GIMP is a multiplatform photo manipulation tool.
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
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.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.