Facetracker Documentation
Facetracker is a wrapper UI for OpenSeeFace written in python using libadwaita and GTK4. It's primary use case is for VTubbing on Linux as most VTubbing Software is only supported on Windows. While those often times work fine by using Wine or Proton their integrated Webcam tracking is often times broken due to Wine and Proton not properly supporting Webcams. Therefore the facial tracking data are to be fetched by an external application and then send over the local network to the VTubbing application.
One prominent tool to do this is called OpenSeeFace developed by Emiliana. What Facetracker does is to put the setup burden to flatpak and flathub so users can just download the application and start using the OpenSeeFace included Facetracker using a handy user interface. For users making use of their phones or other tracking hardware Facetracker is not required.