See Dallas ISD. In the years before I retired, the computer science teachers at Dallas ISD, put courses on Moodle. I did a computer science course based on Visual Basic. I updated a course on web design. I think they may have a Game Design course, I can't remember how much of that got online. A group of teachers put up a PreAP Computer Science. Johns Hopkins University Center for Talented Youth also has courses, and does some school based. You'll have to reach them directly to see what they have you can use, but we do teach Java/AP Computer Science and a sequence of Web Design courses that ends with JavaScript. We also have Python for Elementary and Python for Middle School. CTY also teaches just about every other course you can think of, but I don't hav a lot of knowledge about them.