The British Lawn Tennis Association has made a huge push for free resources. Their "LTA Coach App" includes downloadable session plans for advanced juniors.
The United States Tennis Association regularly posts full-length lectures from their coaching conferences. Search for "USTA High Performance Webinar." You will get biomechanics analysis equal to the ITF manual. itf advanced coaches manual free
If you cannot use the app, you can find related technical excerpts and course materials through these official sites: The British Lawn Tennis Association has made a