- GeoGebra Institute of Sweden
- Parametric Curves
For those who think Mathstudio is fantastic: So is GeoGebra. Mathstudio may have stuff that GeoGebra doesn't but GeoGebra has a lot of stuff that Mathstudio doesn't. But while Mathstudio is only command ddriven, Geogebra uses commands, tools, spreadsheet, graphical UI...