EVA (Excess Variability-based Age) computes the VarX values and VarX90 ages for a given list of stars. The package retrieves information from Gaia, performs basic var90 calculations, then calculates the age of the group in a given band or overall (by combining all three bands). EVA then analyzes and plots the results.
https://ui.adsabs.harvard.edu/abs/2023ApJ...953..127B , https://ui.adsabs.harvard.edu/abs/2021A%26A...649A...3R