Pangu -- the downloadable tool that became a household name in the jailbreak community after the release of iOS 7.1 -- has finally released a Mac-compatible version of its 8.0/8.1 app. Just like the Windows version, the new OS X version walks you through the process of freeing your iOS device from the restrictions it has from the factory.
Personally, I've had a great deal of success with Pangu on Windows, and it's always performed flawlessly across any iOS device I've decided to jailbreak. The OS X release is great news, and assuming it works as well as it does on Windows, it should have no problem quickly accomplishing its task. That being said, jailbreaking comes with risks that include accidentally bricking your device or otherwise rendering it unusable, so proceed accordingly.