ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
GIMP - GIMP is a multiplatform photo manipulation tool.
Instagiffer - Create GIFs from anything!
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.
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.