Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
Platequery - Report drivers or contact them with license plate lookups
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
WWDC app for OS X - An app to view and watch WWDC sessions on your Mac
Meetup for iOS and Android - Discover groups that are all about the things you love
Avenue - Event messaging app for WWDC attendees