Luxand Blink is a free software that lets you login to your PC by using Webcam and Facial Recognition. Blink utilizes excellent and efficient software to register your face. It then lets you login via your webcam, just by looking into it. It uses advanced face recognition for that.
This adds an extra layer of security to your computer and a more secure way of logging into your system. Some may be inclined to call it a bit of a novelty product, but for many it is a viable, efficient, and secure way of logging into the system. This is especially useful on those computers that do not have advance login features, like Fingerprint recognition.