GeoGebra is a free and multi-platform dynamic mathematics software for schools that joins geometry, algebra and calculus.
This program allows you to build drawings of almost any complexity. You can add points, lines, vectors, polygons, circles, angles, text and even images from files (.gif, .jpg, .png, .tiff) to your drawings. All objects have bindings to coordinates. So you may get to learn various information like distance or length, area, angle, equation. Besides standard figures, there are many additional elements for editing (parallel line, semicircle, locus, mirror at line, bisector, etc.). Every element can be changed dynamically afterwards. Just type-in an equation in the form and the element will be added ('(x-3)^2+(y-5)^2=100' for the circle).
Click here for a GeoGebra example of Pythagoras' theorem with a ladder against a wall.
GeoGebra has a very user friendly and beautiful interface and, don't know if I can say this enough, it is absolutely free. GeoGebra is fast, and works steadily. You may export the resulting image as a picture or save it on the disk in a special format. Also you can print your drawing (with scale mark) out. Also being Java-based, GeoGebra will run on any operating system and so thats a big plus.
Check out GeoGebra and reply below with what you think!
(Thanks to Dmitry Neganov for this post)
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