The Wolfram Demonstrations Project is hosted by Wolfram Research, whose stated goal is to bring computational exploration to the widest possible audience. It consists of an organized, open-source collection of small interactive programs called Demonstrations, which are meant to visually and interactively represent ideas from a range of fields.
Click the figure below to view the index about Wolfram Demonstrations Project & GoGeometry.
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Wolfram Demonstrations Project & GoGeometry