The Aviary Effects API that helps developers create their own Instagram recently made the API public and updated its developer portal. In addition, the company is offering a short-term developer contest, so you'll need to get going quickly.
Apple's iOS Camera APIs make the iPhone a manual camera—for third party developers. Fleksy to be early out of the gate on iOS 8, but could use more APIs. Plus: Australian startup says it owns the "HealthKit" name, and Contract Logix a API integration.