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feh

RPN Taschenrechner

dc
rpncalc
orpie
HP 42s (Free42) http://thomasokken.com/free42/
HP 67 (by Christopher Neufeld) http://linux.dltube.net/download6317.html
HP 50g (x49gp) http://www.raclot.org/dev/hpcalc/