KFDShield/KFDMicro
this is a fork of the KFDtool project designed to run on arduino series microcontrollers.
it uses a 3.5mm audio jack for keyload data, there are adapters available to goto a hirose connector etc
Be aware that their is another ripoff model of this known as kfdmini which uses a different connector pinout and is a Chinese knock off that lots of folks have had issues with
KFDShield/KFDMicro Resources
Note you'll also need a Arduino for the KFDShield! This is only for the shield model, the micro doesn't require one.
KFDShield 3.5MM to Hirose Connector
Project Github here: KFDShield Github
Software here: Version 1.7.3
KFDShield 3D printable case at printables (make sure you scale to 101%, it at 100% would not fit my KFDShield!)