Fleksy is an alternative keyboard for iOS that I first tested when Launch Center Pro, an initial partner, implemented it a few months ago. Within the limitations of iOS, Fleksy provides a different typing experience that can be faster than Apple's default keyboard.
This library includes some kind of digital styled font drawer. They're not TTF files or something. They just draw fonts with CoreGraphics. So, you don't need to worry about redistribution license of font files when you release your application.
An objective-C API that uses the new iOS 7 UIView snapshot category drawViewHierarchyInRect:afterScreenUpdates: to produce Apple Notification and Control Center like blur effects. 7blur supports both live real time and static blurred backgrounds enforcing UI depth.