I've been trying to implement a open source version of the Wolfram language for FenixEdu but is extremely hard. For the most part is possible as long you don't use stuff that depends of proprietary data sets. Also, after 30 years working on it, it is quite faster than anything else.

I truly would like to see the community come up with a open source version of it, but with such a huge size, the language would be near impossible for one single individual to implement a compatible version.