Giphy Chrome Extension - Respond to emails, tweets & more w/ GIFs in a jiffy
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.
All the GIFs - Search all the GIFs right from your Mac
Giphy For Gmail - Add the power of GIFs to your email
Firefox Multi-account Containers - Sign in to two different accounts on the same site
Coub - Coub is an app that features GIFs, but the GIFs that you select and send to other people have sounds.