ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Instagiffer - Create GIFs from anything!
The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.