Hello,
This is a fork ("a modified copy") of the main sourceforge external repository.
This is not included in pd-extended but I've planned to release binaries for MacOSX, Windows and Linux in a not too far future...
Concerning FaceOSC, it wroks great and it's now included in [pix_opencv_facetracker], it's pretty experimental since it has not been tested widely.
Depending on what you need exactly, you can also use the [pix_opencv_haarcascade] external with some free data set or with your own trained model.
Hope this helps.
Antoine