Unlock your Mac using a trackpad gesture. Gesture Unlock is a hackathon project created at MHacks 6 in September 2015. It allows you to unlock your Mac by drawing a picture password using your mouse or trackpad rather than entering a password. It uses the $1 gesture recognition algorithm for determining whether the shape is correct or not. It's pretty hacky and not really ready for any kind of release.
GestureUnlock uses MultistrokeGestureRecognizer-iOS for gesture recognition.