Giphy - Search all the gifs and make your own animated gif
ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
char280 - When 140 char isn't enough. Tweet up to 280 characters.
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.
Twitter Threads - Twitter introduces a built-in Tweetstorm feature ⚡️
Instagiffer - Create GIFs from anything!