Spotify - Map shows when two people play same song at same time
Alcamy - Free, open self-learning platform. Learn & teach anything.
Lazyset - A Spotify playlist mixing Facebook Messenger bot
Stacks - A bookshelf for your online courses
22tracks - DJ curated Spotify playlists on iOS
Airschool - Airschool is a live-streaming educational platform with engagement and monetization tools to help anyone start teaching online. It can be finance, business, wellness, meditation, branding, marketing; in short, anything you want!