If you have an iPhone, iPad or iPod touch, you might have heard about Cydia and Rock.app. They are both stores (the same as App Store) for 3rd party apps, themes, tweaks and everything you may want for your iPhone. Cydia was developed by Jay Freeman a.k.a Saurik, and registered under SaurikIT, LLC and is owned by Jay Freeman, and Rock.app is registered under Rock Your Phone, Inc and is owned by Mario Ciabarra.