Apple has developed a public beta of iOS 9 for everyone. Anyone interested in the public beta can try it now. What you need to do is to join the Apple Beta Software Program with Apple ID.

Apple Now offers iOS 9 public beta for everyone

The iOS 9 public beta is considered a more refined release than the previous versions released only for developers lastmonth. Very recently, Apple also made available iOS 9 beta 3 to registered developers. Apple iOS 9 brings with itself a number features and tweaks over its predecessor including more efficient Siri, split-screen multitasking on iPad, and under-the-hood upgrades among others.

If you wish to grab this opportunity link yourself to Apple Beta Software Program as aforementioned. Also, be aware that the firmware is not finished, so random bugs are likely to pop up.