Maxima is also part of Sage, so I suspect some people have used it without being very much aware of it:
All of it virtually impossible without Maxima
- on a WxWidgets GUI
- on Android
- on Jupyter notebooks
- in the browser on WASM
- to be used via SageMath or KDE Kantor or in a CL REPL.
Follow https://github.com/CodyReichert/awesome-cl/ and hope you and the fediverse find cool stuff!
The alternatives I had available at the time were my graphing calculator (more limited) or Mathematica (the university had a volume license I think but I didn't really want to get used to a tool I wouldn't always have)
I think all the alternatives I knew about were sufficiently inaccessible in 2009 that I learned a very small bit of Maxima and wouldn't attempt learning any other CAS.
It wasn't easy, but I usually found a function in its documentation doing what I needed.
Just the idea of software having been maintained since 1960s is very cool.
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