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Tool: GeoGebra
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Go to: http://www.geogebra.org/cms/ (opens a new window)
Description:

GeoGebra is a free and multi-platform dynamic mathematics software for schools that joins geometry, algebra and calculus. On the one hand, GeoGebra is a dynamic geometry system. You can do constructions with points, vectors, segments, lines, conic sections as well as functions and change them dynamically afterwards.

On the other hand, equations and coordinates can be entered directly. Thus, GeoGebra has the ability to deal with variables for numbers, vectors and points, finds derivatives and integrals of functions and offers commands like Root or Extremum. These two views are characteristic of GeoGebra: an expression in the algebra window corresponds to an object in the geometry window and vice versa.

Technology Type: Computer 
Guide: User's Guide (opens a new window)
Author: Markus Hohenwarter
Language: English 
Cost: Does not require payment for use

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Tool: GeoGebra Central
Courses: Geometry General
Algebra General
Calculus General

  ScottS
Comment:Want dynamic and interactive in your classroom, well this the the freeware to get - EASY to use and great for linking algebra to graphics and geometry!!!!! Also makes Java applets for webpages. JUST SUPER!!!!
  Tide
Comment:Powerful, useful and fun!