No WWDC app for OS X videos yet. You could help us improve this page by suggesting one.
YoutubeMultiDownloader - Just like its name YouTube Multi Downloader, it is an online website for downloading the videos of downloading without using any video download and accelerator.
WWDC Together - Watch and discuss WWDC together
KeepVid - A free web application that allows you to download videos
WWDC TV - Watch WWDC video on your Apple TV
SaveFrom.Biz - Convert YouTube video URL to MP4 file and download it to your device. SafeFrom is the best YouTube video downloader and converter.
NotesKey - Time travel through Apple's keynotes