If you're looking to run a successful developer program, you should probably pay attention to Mathys van Abbe. He's the founder of Mobypicture (our Mobypicture API profile), which has just celebrated its 500th developer.
Ocutag, a division of Ricoh Innovations, aims to help apps deliver content to users taking photos. Their aim is to herald a new model of retail. App designers upload images and tag them with information. When users snap pics of the same thing in reality, information can be delivered through the app, such as that appearing in the graphic of the scarf below: where to buy it, details about it, local stores that carry it. What information is delivered is up to the company with the app. The company provides the Ocutag API for integration.
Animetrics, a leading developer of 2D to 3D face recognition and face creation solutions, provides the Animetrics Face Recognition that can be used to detect human faces in pictures and match them against a set of known or documented faces. This tool is specifically useful for applications for the fashion and online entertainment industries, or for law enforcement or military intelligence where accurate identity resolution is a necessity.