Cool Math has free online cool math lessons, cool math games and fun math activities. Really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers area
Geometry Zen is a free, online, open-source, and collaborative tool for Computational Modeling combining programming languages, 3D visualization, Physical Units, and Geometric Algebra - the Unified Mathematical Language for Physics and Engineering in the
Doug Matzke home page with papers on subjects of Limits of computation, Physics and computation, consciousness, Quantum Computation, qubits, ebits, geometric algebra, Chi, alternative healing.
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MultiPi offers online math, vocabulary and science programs covering elementary to high school (K-12), with content that adapts to each individual student
MultiPi offers online math, vocabulary and science programs covering elementary to high school (K-12), with content that adapts to each individual student