Mac: OS X El Capitan and iOS 9 were announced just a month ago. Today, the public betas for both are available for everyone willing to dip their toes into the new OS.
iOS 9 comes packed with some new proactive features for Siri, transit directions, multitasking on iPad, and some Spotlight improvements alongside other minor updates. As for El Capitan, the new operating system isn't incredibly exciting, but it does have a bunch of minor improvements that make it a bit easier to use. These include a more powerful Spotlight, a new Mission Control and a new split-screen view for full-screen apps. Even though these are public betas, they're still beta products, so install at your own risk. It's probably not advisable to install either on your primary machine, and if you're going for the El Capitan beta, you should install it on a separate partition. Head over to Apple Beta Program page to sign up for the beta if you haven't already.