Smile Snap! - Automatically take a photo when everyone is smiling
Face++ - API for face detection – also detects gender, age, pose
PhotoKharma - Automatically get all the photos friends' take of you
Facesoft - The world's most accurate face recognition algorithm
Facial Recognition by FB - Get notified if someone tries to use your photo on Facebook
Capsule Camera - Smart camera that auto-saves moments to shared albums.