|FaceOSC. FaceOSC is a tool for prototyping face-based interaction. It’s built on non-commercial open source FaceTracker code from Jason Saragih.
FaceOSC comes as an example app with the ofxFaceTracker addon for openFrameworks. You can download an OSX 10.5+ binary at github.com/downloads/kylemcdonald/ofxFaceTracker/FaceOSC.zip
OSCulator is an excellent program for routing OSC and MIDI. Download it at osculator.net
Some of the “face gestures” (or metrics) are more stable than others. Lighting can also have a huge influence on the stability of your values: even lighting from the front coupled with a dark background can give the best results.