There is a website called Techmatrix that allows you to compare products by categories and disabilities. It informs you of the grade levels that the products are useful for and it also shows you what operating systems the product will be accessible.
I compared GeoGebra, Crystal Rain Forest, Geometer's Sketchpad, and Poly
GeoGebra was the only free one and it is used on computers. While Geometer's Sketchpad was the most expensive.
All of the products work with autism, emotional disturbance, specific learning disability, and speech and language impairment.
Geometer's Sketchpad can be used across more age levels than the other products.
All of them except for Ploy worked with many different math components such as: expressions and equations, functions, geometry, operations and algebraic thinking. Poly only worked with geometry.
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