WWDC app for OS X - An app to view and watch WWDC sessions on your Mac
IINA - The modern video player for macOS
WWDC Together - Watch and discuss WWDC together
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
WWDC for macOS Version - The best way to watch WWDC on the Mac
BitTorrent Live - Live streaming video. iPhone, Apple TV, MacOS. Android soon.