Face++ - API for face detection – also detects gender, age, pose
Photofeeler - Choose your profile photos using hard data
Facesoft - The world's most accurate face recognition algorithm
Photo Aesthetics by Everypixel - AI to rate photographs according to their aesthetic value
Facial Recognition by FB - Get notified if someone tries to use your photo on Facebook
DATEnhance - upload a couple of pictures, and go on to rate others.