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
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.
NotesKey - Time travel through Apple's keynotes
Metastream - Watch streaming media with friends