Giphy Chrome Extension - Respond to emails, tweets & more w/ GIFs in a jiffy
Odio - Create GIFs with live audio
All the GIFs - Search all the GIFs right from your Mac
GifLab - The easiest way to create GIFs on your iOS device
Firefox Multi-account Containers - Sign in to two different accounts on the same site
Gifmock - Easily create high quality GIFs