The Museum of HP calculators
Dave Hicks’ wonderful site. We won’t be here without him!
HP48 software archive - HPcalc.org
Dedicated to the HP 28, 38, 39, 40, 48, 49. Tons of software!
The HP-41 archive Website
Only Hp-41 and peripherals. If this is your dream machine, take a look.
The HP28 WWW Archive
Site devoted to the Hp 28C/S
The Italian HP Calculators Museum
Gianmaria’s fine collection