naif extracts frequencies and respective amplitudes from time-series, such as that of an orbital coordinate. Based on the Numerical Analysis of Fundamental Frequencies (NAFF) algorithm and written in Python, naif offers some improvements, particularly in computation time. It also offers functions to plot the power-spectrum before extraction of each frequency, which can be useful for debugging particular orbits.

tropygal is a pure-python package for entropy estimates in the context of galactic dynamics, but can be used to estimate the entropy in any context. It currently focuses on nearest-neighbor estimators, and it also provides a function for density estimates. Additionally, it provides functions for analytical distribution functions and density of states for dynamical models that have analytical expressions.