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For Python, at least, the most popular numeric computation library (NumPy) uses a fair bit of Fortran under the hood. I'm not certain whether the matrix operations do, but it certainly wouldn't surprise me.

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Doesn't NumPy just use BLAS and LAPACK for matrix operations?

The vast majority of BLAS and LAPACK are written in Fortran (at least, the ones provided by netlib.org). Github also reports that OpenBLAS is around 50% Fortran, so there's quite a bit there too [1]. Usually when you call BLAS functions from C you're really calling a cBLAS wrapper to some Fortran function. This is generally why you see -lgfortran -lf77blas when you compile programs that require numerical tools.

[1] https://github.com/xianyi/OpenBLAS

At least in OpenBLAS, most (all?) of the BLAS routines are C functions that call kernels written in assembly, but many of the LAPACK routines are the Netlib reference Fortran versions.

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