GeoGebra (www.geogebra.org) is free dynamic mathematics software for all levels of education that brings together geometry, algebra, spreadsheets, graphing, statistics and calculus in one easy-to-use package. Interactive learning, teaching and evaluation resources created with GeoGebra can be shared and used by everyone at www.geogebratube.org.
The GeoGebra App for PowerPoint lets you insert interactive GeoGebra materials into your presentation. Any changes you make to these GeoGebra materials are saved in your PowerPoint file. You can also export your presentation with embedded GeoGebra materials as an Office Mix and they will work with any web-browser.
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NOTE: Some features are not supported in Internet Explorer 9. To access local files in IE9 please upload them to your profile from browser first.