Visual Calculus. (There is a section on Pre-calculus.)
Equation Plotter from The Lawrenceville School. Best graphing webware I've ever seen, and it's free.
Mathworld. The world's most extensive math resource. Great reference - rather technical, however.
SOS Math. The Algebra and Matrices pages are good references for precalculus students
Ask Dr. Math. Answers to a lot of common questions. Good Explanations.
Karl's Calculus Tutor.
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