Imgur's Video to GIF - Make a GIF from hundreds of video sites
You-Get - Command-line utility to download media contents from the web
GIFMaker for Mac - GIFMaker – Created a GIF from a video or Images is the easiest way to create an animated GIF on your Mac.
CONV. - Convert YouTube video to MP3, GIF or MP4
GifRun - GifRun provides easiest way to find and create animated GIFs from YouTube, Video, Images or Vine...
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline