GeoGebra

Free dynamic math software for geometry, algebra, and calculus

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Users draw geometric objects, define functions, and drag points to see relationships change. It includes graphing, spreadsheet, and 3D tools. A large library of shared activities covers school topics.

It runs in a browser and on phones and tablets.

Desmos is a close alternative for graphing. GeoGebra suits mathematicians and teachers who explore ideas visually.