System76 released one recently - https://github.com/system76/recognizer https://github.com/system76/recognizer You're right though - we have a home rolled one

System76 released one recently - https://github.com/system76/recognizer https://github.com/system76/recognizer You're right though - we have a home rolled one where I work that is very robust and could easily be generalized, but it's also fairly simple (to build). I suspect most engineers jump at the chance to get to build a project like this rather than vendoring in something external (whether FOSS or commercial).