OS X 10.11.5 beta 3:
The OS X El Capitan 10.11.5 update improves the stability, compatibility, and security of
tvOS 9.2.1 beta 3:
This is a beta version of tvOS for the new Apple TV. Apple TV (3rd generation) and earlier are not supported. Download the Restore Image to update your Apple TV through iTunes on your Mac or download the Configuration Profile for over-the-air updates through Apple Configurator.
Safari Technology Preview 3:
Get a sneak peek at upcoming web technologies in OS X and iOS and experiment with these technologies in your websites and extensions.