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PlanetMath (Popularity: ): A collaborative encyclopaedia with entries contributed under the GNU Free Documentation License.
Math2.Org (Popularity: ): Formerly Dave's Math Tables. Mathematical tables on-line and downloadable.
Digital Library of Mathematical Functions (Popularity: ): This mockup gives an idea of the current ideas about the design and organization of the new Digital Library; these ideas are, of course, subject to change. Content only is ...
Platonic Realms (Popularity: ): Online resource for the mathematics community: links library, bookstore, quotes, and online articles.
Math Assistance (Popularity: ): Lists rules and formulas for a number of mathematical subjects, such as plotting graphics, functions, factoring, derivatives, integrals, matrices, vectors, and numerical analysis. In English, French and Turkish languages.
Summation Formulae (Popularity: ): For polynomials of degrees up to 50, generated using the Euler-Maclaurin method.
Mathematical Atlas (Popularity: ): A topical guide to modern mathematics that explains the subdisciplines. Includes graphics that represent their relative size and relationship.
Geometry Formulas and Facts (Popularity: ): An excerpt from the 30th Edition of the CRC Standard Mathematical Tables and Formulas, covering the area of Geometry (minus differential geometry), by Silvio Levy.
Wolfram: Mathematical Functions (Popularity: ): Includes advanced formulas and visualizations of various equation, such as elliptical curves.
The Math Reference Project (Popularity: ): An electronic archive of articles by Karl Dahlke on topics ranging from high school geometry up to graduate level topology.
On-Line Encyclopedia of Integer Sequences (Popularity: ): Identify a sequence by entering few terms in the sequence. Additional information includes examples, formulas, and related links.