Face.com has just opened up their APIs so that you can integrate their face detection and recognition technology with your apps and services. Whether you’re looking to add tagging for photos, cool sci-fi experiences, or creative flavors to your apps, Face.com API here to help.

They offer services for detecting, recognizing, and tagging faces in any photo, through our REST API. Face.com’s services are offered for FREE with rate limits. Whitelisting and Premium licensing options are available. Also, they process photos from anywhere, so you can mix and match photo sources with user IDs, which could enable you to, say, recognize Facebook users in Flickr photos.

Requirements: -
Demo: http://developers.face.com/new-detector-demo/
License: License Free