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...It features its own programming language, and many users have contributed useful packages in various areas over the decades. It is GPL-licensed and largely written in Common Lisp. Executables can be downloaded for Windows, Mac, Linux, and Android; source code is also available. An active community maintains and extends the system.
Website: https://maxima.sourceforge.io
Additional add-on packages for Maxima can be found at: https://github.com/maxima-project-on-github/maxima-packages
Wcalc is a powerful arbitrary-precision calculator. It has standard functions (sin, asinh, logtwo, floor, etc), many pre-defined constants (pi, e, c, etc.), variables, "active" variables, command history, and hex/octal/binary i/o, conversions, and more
A small, basic, yet powerful and competent primality tester.
...All NCPrime applications released after 1 November 2012 use the Qt framework and thus require Qt libraries (included) for cross-platform compatibility.
IsItPrime is in active development.
*** There is now an active effort to include a QT-only (no KDE) based IDE for Octave that is part of the main Octave source code. I recommend that you build and test that version of an IDE, as it will be the most supported option going forward. ***
The octavede is a development environment for the Octave mathematical software package. Octave normally is run in a terminal.