Quadratic Equation Calculator     
The Quadratic Equation Solver posted on this page solves for both real and imaginary (if applicable) results. Also on this site: solvers for the Cubic and Quartic equations, N Equations in N Unknowns, Eigenvalues and Eigenvectors, Cubic Spline Interpolation, Numerical Integration, and Least-Squares Data-Fitting.
http://www.akiti.ca/Quad2Deg.html     more info

Online math game     
Online math game at educationtrak.com will dramatically improve comprehension and test scores. Focus until material is mastered .Get better grades, Receive immediate results and one-on-one tutoring.
http://www.educationtrak.com     more info

BinaryMath.info - A binary math resource.     
A complete resource for binary math. Learn about binary numbers, its arithmetic, and conversions. Practice problems are also available.
http://www.BinaryMath.info     more info

Simplex Method     
PHPSimplex: Online tool to resolve linear programming problems of Operations Research using the Simplex Method, the Two-Phase Simplex Method and the Graphical Method algorithm.
http://www.phpsimplex.com     more info