These are some of the additional files made available by Kevin Karney as used and mentioned in his book "The Equation of Time - Æquātiō Diērum", which you can download from the publications page.
Excel Spreadsheets
Calculating EoT for a Year - Fourier Method
Calculating EoT for a Year - Kepler's Method
Python code
Python Code for Analemmas
Python Code for an Equation of Time Table
Python Code for using the Fourier method for the EoT and Declination
Python Code for calculation the EoT using the Meeus method