TubeLister - Generate a YouTube playlist from your opened tabs.
Tuned Rocks📺 - Discover🔎 curated Youtube videos 24/7
DiskyT - Youtube playlists done right
NewPipe - NewPipe is a lightweight YouTube front-end for Android.
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud
JuniorTube - Curate YouTube playlists. Remotely push them to kids iPads.