mtspec

"The Multitaper Spectrum Estimation Library mwlib.a is a Fortran 90 Library containing different subroutines to estimate the Power Spectral Density of real time series.

http://wwwprof.uniandes.edu.co/~gprieto/software/mwlib.html
 
"mtspec is a Python wrapper for the Multitaper Spectrum Estimation Library by Germán Prieto. The relevant publication is

Prieto, G. A., R. L. Parker, F. L. Vernon. (2009),
A Fortran 90 library for multitaper spectrum analysis,
Computers and Geosciences, 35, pp. 1701-1710.
doi:10.1016/j.cageo.2008.06.007

It enables you to calculate Slepian windows, perform multitaper spectral estimations with various options, calculate Wigner-Ville time-frequency distributions, and construct coherence spectra with multitapers.

It currently wraps version 3.1 of the library. This is mainly due to later versions using FFTW which would introduce an additional dependency."

http://krischer.github.io/mtspec/

https://github.com/krischer/mtspec