Giphy Chrome Extension - Respond to emails, tweets & more w/ GIFs in a jiffy
Odio - Create GIFs with live audio
PopKey for Desktop - Quickly share ridiculous GIFs from Mac or Windows
GifLab - The easiest way to create GIFs on your iOS device
Vlipsy - Easily add your favorite video clips to any conversation.
Gifmock - Easily create high quality GIFs