TubeLister - Generate a YouTube playlist from your opened tabs.
Tuned Rocks📺 - Discover🔎 curated Youtube videos 24/7
OrganizeTube - Create video playlists from Youtube, Vimeo and other sources
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud
Poolsuite™ - The super-summer music player
Quite a Playlist - Find deleted & private video details from YouTube playlists