Is this going to remain free? I´d love an open source project like this where I could run the tests in my own machine.
Every course now has a "work in your own editor" mode: you can download a zip with the starter code for every lesson plus a run_tests.sh that runs the full test suite locally. After that, you can push it to a public GitHub repo, we will judge it based on our grading system and internal tests
I like the idea of a community FOSS or source available offering, I have a lovely pile of ram from the before times (when it didn't cost an arm and a leg).