TL;DR: A wide range of online courses from MIT are available to take for free on edX.

Through the DataCamp Classrooms program, eligible teachers and students worldwide can register for free access to the entire DataCamp platform. This includes training in specific technology and tools ...

If Windows is your preferred operating system, consider these open-source apps. There are numerous open-source apps available for almost any task. These are all free to install and use on Windows.