Singapore Math® Live founder, Brenda Barnett, also founded High School Math Live. These live and interactive classes, including Pre-Algebra through AP® Calculus AB, meet online twice a week and provide homeschool students with excellent math instruction. Click below for more information.
If you're looking for live and interactive online classes for subjects other-than-math, I wholeheartedly recommend Excelsior Classes. Click here to find out why I like them so much, and click below for more information.