- WolframAlpha is a great resource. It is a “computational knowledge engine”, which means it does a lot of math!
- GeoGebra is a free program that is great for graphing functions and creating geometric diagrams.
Below is a source for math videos. They do a good job of going through the skills but may not do a great job of explaining the concepts. They are continually getting better.
- Khan Academy also has videos. These typically just have writing and voice.