Seald - Keep your conversations secure, everywhere.
Spotify - Map shows when two people play same song at same time
Keybase Chat - End-to-end encrypted chat built into Keybase
SoundCloud - Enjoy music & follow favourite artists
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
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