TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
Spotify - Map shows when two people play same song at same time
Galette - Galette is a membership management web application towards non profit organizations.
SoundCloud - Enjoy music & follow favourite artists
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm