makejinja can be used to automatically generate files from Jinja templates. This allows you to load variables from external files or create repeating patterns via loops. A very interesting use case for this tool is generating config files for Home Assistant: Using the same language that the built-in templates use, you can greatly simplify your configuration. When creating for example dashboards, it allows you to create a view for each room based on a single common template, dramatically reducing the maintenance overhead of complex dashboards. I originally developed this for my smarthome setup, but thought it may be useful for others as well!
A concrete example for Home Assistant can be found in the tests directory: https://github.com/mirkolenz/makejinja/blob/main/tests/data
For more information like detailed features or installation/usage instructions, please visit the GitHub repo.