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ationalatlas.gov™ contains a remarkable range of products and services to meet the diverse needs of people who are looking for maps and geographic information about America. Dynamic maps are innovative illustrations of geographic phenomena. We combine the science of mapping with today's multimedia to offer maps that are useful, understandable, and that stimulate interactivity.

"In this article we introduce the free educational mathematics software GeoGebra. This open source tool extends concepts of dynamic geometry to the fields of algebra and calculus. You can use GeoGebra both as a teaching tool and to create interactive web pages for students from middle school up to college level. Specifically designed for educational purposes, GeoGebra can help you to foster experimental, problem-oriented and discovery learning of mathematics. We will illustrate the basic ideas of the software and some of its versatile possibilities by discussing several interactive examples."

In the portal you'll find a dynamic textbook, lesson plans, widgets, interactive Demonstrations, and more built by Wolfram education experts. Absolutely a great resource. Builds in representations, applets, explanations of variable use etc. Great tool.  Since it is in Beta, I am wondering how long it will be free and what their plans are for the future. 

Adobe is launching a new tool and looking for some classrooms to pilot. I don't think it will stay free for long, but it looks like an easy and very dynamic setting.

Great tool for creating dynamic timelines. Easy to use with great examples. Here's an example that a teacher uses with his English class http://mhsenglish10.wikispaces.com/Early+Am+Lit

Allows you to make dynamic charts.

Interesting that the more students are allowed to access content via dynamic and graphical approaches that their scores increase. Why are we staying with symbolic/procedural approaches?

Online map that supports the USGS wall map. The site has several different layers, and map perspectives to choose from. 

GeoGebraWiki is a free pool of teaching materials for the dynamic mathematics software GeoGebra. Everyone can contribute and upload materials! All contents of this pool may be used free of charge.

Neat tool for teachers. Need a quickly designed number line or graph paper. From NCTM and Illuminations, easy to use but not super easy to manipulate. Good for basic graphics needs.

A collection of 279 Math Applets designed by International Education Software. Apps show individual concepts from multiple perspectives, usually conceptually from a diagram and graphically. Not very dynamic in that students wouldn't be able to manipulate multiple variables, but great to use with an interactive white board to show connections between representations and to confirm calculations/predictions.