I'm experimenting with GeoGebra - an open-source tool from GeoGebra.org - as a tool for visualizing mathematics. Results so far are limited, but I'll post as they arise.

- IntegerAddition - uses vectors to visualize addition of positive and negative values.
- NormalDistribution - find probabilities for regions of a normal distribution.
- ThreeCircles - demonstrates drawing three mutually tangent circles centered at the vertices of any triangle.