Naif

$\texttt{naif}$ is a pure-python package for numerical analysis of frequencies for orbits. It is based on the NAFF algorithm originally proposed by Laskar (1990, 1993), and further developed by Valluri & Merritt (1998). It is specially based on, and improves on, the Fortran code developed by Valluri & Merritt (1998). Besides extracting the frequencies with largest amplitudes in the spectrum, the package also has tools to print the spectra before extraction of each frequency and to "debug" the frequency identification around a specific peak.

A summary of the algorithm and some discussion on frequency analyses can be found in Beraldo e Silva et al 2023. Please, cite this paper if you use $\texttt{naif}$.