you-tldr - Get the tldr of any YouTube video in seconds
SliceTube - The Fast and Modern way to cut and download YouTube videos
OrganizeTube - Create video playlists from Youtube, Vimeo and other sources
GIFit! - Quickly turn YouTube videos into GIFs (chrome extension)
Spoke Enterprise - Share video summaries and transcripts of your conversations.
TubeLister - Generate a YouTube playlist from your opened tabs.