GIFmaker - GIFmaker gives you the freedom and flexibility to create unique, professional GIFS that are on-brand, on your own!
Giphy - Search all the gifs and make your own animated gif
Gifmock - Easily create high quality GIFs
GIFMUSE - A GIF Museum. Amazing GIFs, curated daily
GIFMaker for Mac - GIFMaker – Created a GIF from a video or Images is the easiest way to create an animated GIF on your Mac.
Crumbles - Crumbles are like reaction GIFs with a way bigger vocabulary