There's Mathics, a subset of the language implemented in Python, but unfortunately after the main author of that was hired by Wolfram, the project seems to have basically died. Still fun for what it is. https://mathics.org/. - Source: Hacker News / 5 months ago

You could try to write more Mathematica functions into SymPy. In other words, contribute to the Mathics project (https://mathics.org/). Source: 11 months ago

Thank you for mentioning Mathics, https://mathics.org/. - Source: Hacker News / almost 2 years ago

Mathics is probably the best bet for this in the long term. Source: about 2 years ago

I'm one of the authors that spent years building SageMath; indeed, the goal of our project is to create a viable free open source alternative to Mathematica (etc.). There's an interesting discussion of actual attempts to create open source implementations of the Wolfram Language in Wikipedia under "Implementations" (see https://en.wikipedia.org/wiki/Wolfram_Language). The first attempt was 30 years ago by... - Source: Hacker News / over 2 years ago

If you're into tensor algebra I can only recommend the beautiful piece of Software Cadabra is: https://cadabra.science/ We wrote an article with it once, 40th order in the Lagrangian, perhaps 50k pages of calculations when all printed. Amazing tool! Thanks Kasper! - Source: Hacker News / about 2 years ago

So I was wandering if there is an symbolic math operations package (like for example SymPy) that is made in mind mainly with operations on PDEs and applications to CFD. I am looking for something similar to Cadabra which is. Source: almost 3 years ago