VXWalkthroughViewController is a quick way to add step by step onboarding tutorials and intros to your iOS 7/8 app. The steps are defined in the existing localisation string tables to make it really easy for you.
VXPromotionViewController is a simple inline and cross promotion display for your iOS 7/8 app. It can load the app information from the Apple AppStore or from your own JSON source.
You can specify specific apps or load available apps for a publisher.