Hi James:
Spark Fun has the GPIB-USB Controller.
In addition to the EZ GPIB software there's also a "Plotter" program at:
that's designed to process time interval data (like you would measure with the HP 5328) and from that get Allan plots.
Note for high stability work you don't have time to make frequency measurements and instead make Time Interval measurements, typically comparing a GPS timing receiver's 1 PPS with a 1 PPS derived from you oscillator.
You might also consider joining the Time Nuts mailing list
Have Fun,
Brooke Clarke, N6GCE
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