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Northern Illinois University
Department of Mathematical Sciences
http://www.math.niu.edu/

Math.com
Homework help, tutoring, and formulas.
http://www.math.com/

The Math Forum
Combined archive and portal to web resources, educational issues, help forums, mailing lists, and teaching materials.
http://mathforum.org/

Algebra Homework Helper
Allows students to enter their own algebra homework problems, and then solves them step-by-step , while generating explanations.
http://www.softmath.com/