TubeLister - Generate a YouTube playlist from your opened tabs.
DiskyT - Youtube playlists done right
OrganizeTube - Create video playlists from Youtube, Vimeo and other sources
Playmoss - Create playlists from YouTube, Vimeo and SoundCloud
NewPipe - NewPipe is a lightweight YouTube front-end for Android.
Poolsuite™ - The super-summer music player