This repository contains the code behind the list at corpus-analysis.com.
The site is written in old-school PHP and definitely not an example of great software engineering. That being said, you're more than welcome to optimize the code!
The architecture is a bit odd: The actual data is stored in a Google Sheets sheet. This sheet, which effectively works as a multiuser backend, is then being downloaded as a CSV file and processed.
If you want to run your own version, you simply need to change and rename
config.php. Also, make sure to remove the analytics code and change the copyright/impressum.