Vine Camera - Vine Camera is one of the best video editing application that allows you to make 6-second looping videos and post it directly to Twitter, Facebook, Instagram and all the other social platforms.
GifJif - Turn GIFs into masterpieces.
Giphy For Gmail - Add the power of GIFs to your email
Giphy - Search all the gifs and make your own animated gif
Coub - Coub is an app that features GIFs, but the GIFs that you select and send to other people have sounds.
GifLab - The easiest way to create GIFs on your iOS device