KeyLemon protects your computer against hijackers (permanent protection) and allows you to unlock (or resume from sleep) with face recognition. Just download the software, create your face model and unlock your session simply and conveniently with KeyLemon. How does it work? KeyLemon is a simple solution which check that you are behind your computer. When you leave the computer, it will automatically lock it and then unlock it when you are back. KeyLemon takes a picture of the hijackers who tried to access your computer when you leave it.

Limitations: 4-day trial (can be extended after submitting a survey)

Requirements:
OS X 10.6+
Intel