I have completed my revisions of the navigation system in my introductory grammar of Hellenistic Greek. The 18 lessons currently available all have a navigation bar at the top and bottom as well as a link to the topical index at the bottom.
It will be quite some time before I am able to complete the grammar, but the lessons that are currently available are 100% free. No adds. No fees. Use them as you please. If you quote them, though, please include the URL in your citation.
Micheal Palmer’s Hellenistic Greek