Giphy - Search all the gifs and make your own animated gif
DeviantArt - deviantART was created to entertain, inspire, and empower the artist in all of us.
GIFmaker - GIFmaker gives you the freedom and flexibility to create unique, professional GIFS that are on-brand, on your own!
Brush Ninja - Hand-drawn Animated Gif Creator
GIPHY Says - Turn your words into animated GIFs!
pixiv - pixiv is an illustration community service where you can post and enjoy creative work. A large variety of work is uploaded, and user-organized contests are frequently held as well.