Livescribe seems to have signed up a 3rd party that is using their SDK to add functionality to a existing app

Livescribe has announced its first SDK partner app to integrate with its device. The Livescribe 3 smartpen allows users to transfer handwritten notes into digital form on one’s smartphone or tablet. Notes appear immediately within the companion Livescribe+ mobile app for iOS via Bluetooth. Third-party developer Gorillized, makers of Outline and Outline+, now offers compatibility with the pen. Other developers are being welcomed by Livescribe to apply for access to the SDK. The Livescribe 3 smart pen is priced at $150, with its Pro edition available for $200.

[From MacNN | Briefly: Livescribe 3 SDK partner app, 500px iOS app remote uploading]