GIFit! - Quickly turn YouTube videos into GIFs (chrome extension)
Turn Off the Lights - With a single click on the lamp button, the page will fade to dark.
Book Video Club - Quick video summaries of the top business books for startups
SliceTube - The Fast and Modern way to cut and download YouTube videos
Wibbitz - Watch video summaries of the news you want.
tubecut. - The only YouTube downloader allows you to trim specific time