OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
Synfig Studio - Just another WordPress site
Instagiffer - Create GIFs from anything!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.