Software (or webapps) for teaching kids statistics or probability? I would like (in the distant future) to teach statistics to kids.  For that matter, I'd be happy to know of software (obviously I am tending towards FOSS), or webapps, that are helpful in explaining statistical/probabilistic ideas to kids (or adults for that matter).
This can be used either by the instructor, the kids, or both.
Suggested format of the answer: Software name, what it help teach, who should use it, link.
 A: RcmdrPlugin.TeachingDemos: Rcmdr Teaching Demos Plug-In
Extending R with Rcmdr and give demos for probability and statistics ideas.


*

*Interactive: correlation and linear regression.

*Static: power of a test, confidence interval, central limit theorem.


Mostly for the teacher - less for the children
http://cran.r-project.org/web/packages/RcmdrPlugin.TeachingDemos/index.html
A: GGobi
Help teach interactive data visualization.  Including - histograms, scatter plots (2d, 3d, multi-d), with brushing/linking etc.
Mostly for the teacher - less for the children (but still possible)
http://www.ggobi.org/
A: animation: A Gallery of Animations in Statistics and Utilities to Create Animations
An R package.  Enables the teacher to create many animation that can be made into webapps.
Great for the teacher to create a children webapp.
http://cran.r-project.org/web/packages/animation/index.html
Examples:
http://animation.yihui.name/
A: Videos and animations from Understanding Uncertainty website.
A: The University of Michigan Statistics Online Computational Resource (SOCR) provides hundreds of Java applets (require Java-enabled browsers) as well as JavaScript-based webapps that run in the browser directly. Some videos, documentation, learning activities are also provided.
