Gfycat: GIFs for Gmail - GIFs at your fingertips everywhere you use Gmail
Giphy - Search all the gifs and make your own animated gif
GIPHY for iMessage - The easiest way to share all the GIFs in all your txts
4Gifs.com - Funny Animated GIF archive.
Rif - Product Hunt for reaction GIFs
Tenor - More than 300M people use Tenor every month to communicate with an animated GIF that expresses...