Imgur's Video to GIF - Make a GIF from hundreds of video sites
Yout - YouTube to Mp3 Converter
GIFMaker for Mac - GIFMaker – Created a GIF from a video or Images is the easiest way to create an animated GIF on your Mac.
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
Owlead - Grow your Twitter with valuable followers, effortless
You-Get - Command-line utility to download media contents from the web