TubeLister - Generate a YouTube playlist from your opened tabs.
NOISESUPPLY - Pandora for SoundCloud
Tuned Rocks📺 - Discover🔎 curated Youtube videos 24/7
Vidlis - Create music playlists from YouTube videos.
OrganizeTube - Create video playlists from Youtube, Vimeo and other sources
Quite a Playlist - Find deleted & private video details from YouTube playlists