- The MacTutor History of Mathematics ArchivesBrief articles on topics in the history of mathematics, information on Greek mathematics, and biographical information about mathematicians.
- The Math Forum: Ask Dr. MathFrequently asked questions about elementary to college-level math.
- Unsolved ProblemsA collection of unsolved mathematics problems and partial answers.
- Wolfram MathWorldA comprehensive and interactive mathematics encyclopedia created by Eric Weisstein.
- Women in MathematicsBiographies of women in mathematics, created as part of an ongoing project by mathematics students at Agnes Scott College in Atlanta, Georgia.

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