dropdrop - Leave messages where you travel for others to discover
WWDC app for OS X - An app to view and watch WWDC sessions on your Mac
Flotogram - Take photos and leave them floating in space
WWDC Together - Watch and discuss WWDC together
World Brush - AR app where you paint on the real world for others to find
WWDC for macOS Version - The best way to watch WWDC on the Mac