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Some NRICH problems can be greatly enriched with the use of software to allow students to plot graphs or explore geometry dynamically.
Spreadsheet software such as Microsoft Excel or the free spreadsheet in Open Office is useful for statistics, numerical problems, and some simple programming. Google Docs also has a spreadsheet function.
Geogebra is free mathematics software for learning and teaching. It includes dynamic geometry, interactive graphing, algebra and spreadsheet capabilities.
Desmos is a free online graphical calculator which allows you to plot many functions together with sliders to change variables.
FMSLogo is a free implementation of the simple Logo programming language.