Faster Video - Allows manipulation of the playback rate of HTML5 videos
ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
Video Speed Controller - Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
Instagiffer - Create GIFs from anything!
Jump Cutter - Office & Productivity
Gifsicle - Gifsicle is a powerful, simple command line tool for creating, editing, and optimizing animated GIFs.