Parallel - Listen to music with friends over Spotify at the same time
WiFi Map - A crowdsourced list of routers and passwords
Slackbox - Spotify playlist collaboration through Slack
Café Wifi Search 🔍 - Find great cafés to work from, worldwide.
TuneMeet - Chat with people who are listening to the same song
Instabridge - Crowdsourced free wifi (now on Android)