Stacniac for Mac RPN calculator works from commands rather than buttons
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Stacniac for Mac Description

Stacniac is a slightly odd RPN calculator that doesn't have buttons: you enter numbers and then type in commands. Apparently, most people prefer algebraic calculators and like to click on buttons, so I don't think Stacniac will have wide appeal; however, I like RPN and prefer to run the calculator from the keyboard. Stacniac has a fairly large set of commands which are invoked by typing short (but hopefully obvious) words. Stacniac is programmable in a limited way. It also has engineering, hexadecimal and currency display formats (which are customizable).

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