Depends on your OS.
The most universal seems to be E5810A or E5810B. It is ethernet to GPIB converter.
Or following
NI (USB GPIB HS or NI GPIB B) - highly expensive, but HS do not require firmware upload.
Agilent 82357B - require firmware upload, not working on RPi and current kernels (4.9,4.4) in windows OK including clones.
Prologix USB GPIB - it is more COM-GPIB apdater, limited support in applications, quite cheap.
Adapters made by Keithley are rebranded NI ones.
Clone which looks like genuine 82357B is working and I did not noticed any performance difference ( genuine has beter shielding, soldering and etc )
Stay away from rectangular 82357B adapter
Check thread
https://www.eevblog.com/forum/testgear/flood-of-new-agilent-82357b-gpib-usb-adaptors-on-ebay-the-real-deal/