Good news! Support for the FibreSeek FibreSeeker 3 is coming soon to SimplyPrint. We're working on finalizing the integration and documentation.
SimplyPrint
No, FibreSeek FibreSeeker 3 is not compatible with SimplyPrint
OctoPrint
Not confirmed yet. We have not checked whether FibreSeek FibreSeeker 3 works with OctoPrint