The OpenCalc: An Open-Source Scientific RPN (Reverse Polish Notation) Calculator
Wonder if today's kids even know what RPN is? You really have to have used it to appreciate it. There is a good link in the article below too giving some history on how RPN came about. I still treasure my working HP41CV.
@danie10 that open source one probably wouldn’t fly with the college board unfortunately, for SAT/AP :(
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