The Concord Consortium is a nonprofit educational research and development organization based in Concord, Massachusetts. We create interactive materials that exploit the power of information technologies.
e-Learning for Kids is a global nonprofit foundation dedicated to free and fun online learning for kids of all ages. (math, science, reading, health and life skills and computers, )
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"With the Mathematics 4.0 free download, you get a full-featured graphing calculator with a formulas and equations library, a triangle solver, a unit conversion tool, ink handwriting support, and more."