PhET
Interactive science and math simulations for learning by experiment
Compute answers, plots, and step-by-step math solutions

WolframAlpha answers mathematical and quantitative questions using computation and a curated knowledge base. Enter an expression or a natural-language question to obtain results that can include symbolic solutions, numerical values, graphs, and related data. Topics range from algebra and calculus to statistics, physics, chemistry, and unit conversion. Students can check a calculation, examine a function's graph, or use step-by-step tools to follow a solution. Factual queries also cover subjects outside mathematics when the necessary data is available. The input determines the calculation, so specifying the expression, units, or conditions helps define what the result represents.
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