Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Designers MX - Curated playlists by designers, for designers.
Facebook Local - Discover places to go and events happening near you
Muru Music - Personalised playlists within seconds.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
WiFi Map - A crowdsourced list of routers and passwords