Loop YouTube videos, and control how long you want to play a YouTube video for.
FacePause - Look away to pause YouTube videos
Koel - A personal music streaming server that works.
mps-youtube - Terminal based YouTube player and downloader
Mood Listener - Handpicked playlists to fit your mood.
ListenOnRepeat - 24/7 curated music streams
Spotify - Map shows when two people play same song at same time