Umoove - Face and eye tracking for mobile devices/gaming
Kamoso - Kamoso is a webcam recorder from KDE community.
WebGazer.js - Eye tracking on the browser
Cheese - Cheese uses your webcam to take photos and videos, applies fancy special effects and lets you share...
FOVE - An eye tracking virtual reality headset (pre-launch)
Webcamoid - Webcamoid is a full featured webcam capture application.