CLEA Hubble Redshift software is a free programme used for educational purposes. It was developed to demonstrate how astronomers use a photon counting method (with a spectrograph) for working out distances of galaxies and hence determining the age of the universe. A screenshot of the main screen is pictured below:
Interface is very simple to use and requires no previous knowledge about the Hubble constant or related subjects. In fact, it is a great beginner's tool for discovering and learning about these parameters! Student manual provides all the necessary information on how to execute basic commands.
Go to CLEA's official download web site (user guides are also available from this URL)
Download the unaffiliated zipped file containing a PDF lab report and a supplementary Excel file (57.7KB)