OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Giphy - Search all the gifs and make your own animated gif
Synfig Studio - Just another WordPress site
GIPHY Says - Turn your words into animated GIFs!
Adobe Animate - Adobe Animate is a Flash, vector animation software.
Drop to GIF - Super simple movie to GIF conversion