WWDC app for OS X - An app to view and watch WWDC sessions on your Mac
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.
Iventlist - Create an app for your event in minutes 🎟️
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
WWDC Together - Watch and discuss WWDC together
Meetup for iOS and Android - Discover groups that are all about the things you love