Linuxtrack is a project aiming to bring head tracking to Linux and Mac.

Current downloads can be found at https://github.com/uglyDwarf/linuxtrack/wiki/Downloads .
Steps to install the universal package (Linux) can be found at 
https://github.com/uglyDwarf/linuxtrack/wiki/universal-Linuxtrack-package .