I've seen Internet courses for languages like German, but I haven't seen free Internet courses. Unless, of course, you count the kind of native-speaker-tutelage you get at language enthusiast websites like Unilang and ZBB.
Is that what you were asking?
I think so. The link I give is an email course. When you sign up you get a tutor that you email your answers to the exercises to. You also get a personal bookmark that gives you the lessons and to me the lessons run well.
Is that what you mean by native-speaker tutelage?