From Luxand Development:
With Luxand Blink login to your PC without touching a thing. Luxand Blink is a free tool to let you log in to your Windows account by simply looking into a webcam - no passwords to type and no fingers to scan. The innovative face recognition technology developed by Luxand recognizes users' faces quickly and reliably, and is able to match the user with an associated account even with different haircuts, beards or mustaches grown or shaved off while completely eliminating false positives. It helps secure workstations in the office, too. No longer will employees have to use yellow stickers to remember their passwords. Face login will complement your corporate security policy just perfectly, providing the benefit of few false negatives and nearly impossible false positive recognitions.