KeyLemon - Log in with your face
KeyLemon adds an extra layer of security to your computer login process by making your webcam do all the heavy lifting. Instead of typing your password, KeyLemon 2.2 associates your face with profile, and then regularly checks to make sure that the person sitting in front of the computer matches the image attached to that profile. If it doesn't think they match, the computer takes a photo via the webcam and then automatically goes to hibernate.
The latest version of KeyLemon introduces a Firefox plugin called LemonFox that lets users log in to three social networking services using their webcam.
Once installed, the program's Wizard will walk you through creating a profile of your face, and link it to your computer's login. By default, KeyLemon will check the webcam every 10 seconds to make sure you're you, although that can be changed in the Control Center's LemonScreen tab. Also, KeyLemon conveniently includes a text-bypass for your login. This is important because, occasionally, KeyLemon won't be able to recognize you.
