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Desmos - A beautiful, innovative, and modern online graphing calculator.
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RStudio - RStudio™ is a new integrated development environment (IDE) for R.
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
Stata - Stata is a software that combines hundreds of different statistical tools into one user interface. Everything from data management to statistical analysis to publication-quality graphics is supported by Stata. Read more about Stata.