Hi Mike,
Been a while, but I'm still here. I've bee asked to present how
PARI tracked Artemis II with open source software running on Linux
at some point in the future, just haven't gotten the scheduling to
work yet.
We're running Debian pretty consistently these days, and our
receiver systems use the SDRangel software. Our server systems
are on Proxmox (which is one of these reasons I migrated pretty
much everything to Debian a few years back; the other reason was
the CentOS 8 kerfuffle).
The GPS NTP server you built was finally decommissioned after the
Agilent Z3816 GPSDO it used as reference rolled epoch and started
reporting a date in 2002... we're now using an Orca GPSDO and a
little low-power Debian box running NTP.