ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Instagiffer - Create GIFs from anything!
Invision - Prototyping and collaboration for design teams
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.
Sketch - Professional digital design for Mac.