You-Get - Command-line utility to download media contents from the web
FacePause - Look away to pause YouTube videos
CONV. - Convert YouTube video to MP3, GIF or MP4
CornerTube - Watch YouTube in picture-in-picture on iPad
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
Video Hub App - The fastest way to browse, search, and manage videos on your computer. Like YouTube for videos on your computer!