Apple has opened up the OS X Beta Seed Program, which allows you to test pre-release or Beta versions of the Mac operating system. Until now you needed a $99 per year developer account to access beta versions of OS X. You can now do so for free. However, you'll still need to accept a NDA, so you should think twice before leaking any new features to the world. Remember, don't run Beta software on Macs that are critical to your business. You are the tester for this software, and it may break at any time. But you will also be one of the first to see new features coming from Apple. OS X Beta Seed Program.