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Leibnitz is the calculator you've always wanted (even if you didn't know it!), short of handwriting recognition.
FAQ: https://github.com/jafl/leibnitz/blob/main/README.md
ChangeLog: http://leibnitz.sourceforge.net/ChangeLog.html
ParaGraph: a parametric graphing calculator. ParaGraph can graph multiple functions at once, perform numerical calculus, find extrema, do log plots, plot polar graphs, fit curves to data, do basic vector operations, and much more.
A cross-platform, text-interpreting calculator written in the Java programming language. Runs on any computer with Java 6 or higher installed. Functions much like a Ti-84, but without the graphing utility.