Hp48
X48 - HP48 calculator emulator v.48.0.6.4
This emulator is capable of providing a faithful replication of the HP48.
X48 for OS X v.1.2
x48 is an HP48 calculator emulator.
Kasm - Saturn assembler v.1.0.0
kasm is an assembler for the Saturn microprocessor, used in the HP48/HP49 calculators.