Book Video Club - Quick video summaries of the top business books for startups
CONV. - Convert YouTube video to MP3, GIF or MP4
Youtube Plus - Home of the extension YouTube Plus that allows you to experience more on YouTube - ParticleCore/Particle
SmartVideo - SmartVideo is a tool that offers users better experience on YouTube as it enables users to have better control over YouTube buffering, and playing options.
Yout - YouTube to Mp3 Converter
BriefTube - Instant video summarizer