Stan isn’t really written in any of those languages either.
The python pystan is wrapper that ships data to/from the Stan binary and marshals it into a python-friendly form; I think Julia’s is similar.
I’m not exactly volunteering to do it, but a PerlStan would not be that hard to implement. As for scientific communication, a point you raised above, I don’t think it’d be too bad. Most readers of a paper would be interested in the model itself, and that would be written in Stan’s DSL regardless.
The python pystan is wrapper that ships data to/from the Stan binary and marshals it into a python-friendly form; I think Julia’s is similar.
I’m not exactly volunteering to do it, but a PerlStan would not be that hard to implement. As for scientific communication, a point you raised above, I don’t think it’d be too bad. Most readers of a paper would be interested in the model itself, and that would be written in Stan’s DSL regardless.