Depends on your definition of "standard library". There are libraries that may not be "standard" (that is, included in the standard) but are standardly availab

Depends on your definition of "standard library". There are libraries that may not be "standard" (that is, included in the standard) but are standardly available on Fortran. You need a matrix solver that will efficiently handle large, sparse matrices of complex variables, that will not degrade when faced with a stiff problem? Fortran has one of those. You can get it on pretty much any Fortran installation. It's solid, stable, and there's decades of experience with using it. So, from that perspective, Fortran has a huge library. For numeric algorithms, virtually anything you want, it has.