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Brightstorm is a provider of online study materials for mathematics (basic math and algebra) as well as ACT and SAT preparation. The ACT and SAT preparation materials are not free, but the mathematics tutorials are free.
Mathigon is part interactive textbook and part virtual personal tutor. Using cutting-edge technology and an innovative new curriculum, we want to make learning mathematics more active, personalised and fun.
This is a computational knowledge engine.
Wolfram|Alpha aims to bring expert-level knowledge and capabilities to the broadest possible range of peopleâ€”spanning all professions and education levels.