OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Clip Studio Paint - The artist's software for drawing and painting.
Synfig Studio - Just another WordPress site
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.
Adobe Animate - Adobe Animate is a Flash, vector animation software.
FireAlpaca - FireAlpaca is the image editor that can be used readily and easily.