No WWDC app for OS X videos yet. You could help us improve this page by suggesting one.
WWDC Together - Watch and discuss WWDC together
Netflix Party - Netflix Party is an extension for watching Netflix remotely with friends and family for movies nights with that long-distance special someone.
WWDC TV - Watch WWDC video on your Apple TV
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
NotesKey - Time travel through Apple's keynotes
ShareTube - Watch YouTube, synced with friends.