Loop YouTube videos, and control how long you want to play a YouTube video for.
Koel - A personal music streaming server that works.
FacePause - Look away to pause YouTube videos
Mood Listener - Handpicked playlists to fit your mood.
mps-youtube - Terminal based YouTube player and downloader
longplay.in - Curated indie music from Bandcamp
ListenOnRepeat - 24/7 curated music streams