Hello board. I am interested in creating a website dealing with high school level math (algebra, slope, rate, graphs, etc). Everything I can find seems to be a bit too robust for what I need (doctorate level capabilities & graphing) as well as seems to be at a pricepoint marketed to large fortune 500 companies. All I need is something with the capabilities for the most advanced high school math, and also has tutorial and testing/grading features. Preferably open source and that I can license commercially. Thank you in advance.