That's cool, but I hope you do not run into legal troubles. According to the mathematica eula, under "ownership", they see their language as part of their product's IP and don't grant anyone to use its distinctive features outside of the product.
Well, this project seems to live on: Mathics: A free, light-weight alternative to Mathematica
Mathics is a free, general-purpose online computer algebra system featuring Mathematica-compatible syntax and functions. It is backed by highly extensible Python code, relying on SymPy for most mathematical tasks.
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Well done! This is a rather major endeavour! is this just for fun? or do you have serious intensions to 'rebuild' Mathematica :o
Thanks for your response! It is just for fun, a serious 'rebuild' requires farrrr more expertise and effort:).
You already implemented pattern matching which is one of the hardest parts I presume ;)