Learney - Knowledge aggregator for developers
NumWorks - The graphing calculator that makes learning math easier.
Multiplication Kingdom - Learn the times tables by playing and having fun in the Multiplication Kingdom (for kids and adults!)
Pixar in a Box - Learn 3d animation with Pixar and Khan Academy
eMathHelp.net - Site is created to help people learn math. Includes algebra, calculus, differential equation calculators and notes with many examples.
Paperspade - Type math easily through just English text!