Standard Mathematical Tables and Formulae
Information and errata for the 29th and 30th print editions and new electronic edition of this book.

PlanetMath
A collaborative encyclopaedia with entries contributed under the GNU Free Documentation License.

Math2.Org
Formerly Dave's Math Tables. Mathematical tables on-line and downloadable.

Digital Library of Mathematical Functions
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 only available in a few places.

Platonic Realms
Online resource for the mathematics community: links library, bookstore, quotes, and online articles.

Math Assistance
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.

Math Tables, Facts and Formulas
A mathematics reference collection of "K through 14" math tables, facts, definitions, formulas and explanations: compiled by Colby Community College Mathematics Department.

Summation Formulae
For polynomials of degrees up to 50, generated using the Euler-Maclaurin method.

Quick Reference Pages
Free reference covering many topics, by Tim Martin.

Mathematical Atlas
A topical guide to modern mathematics that explains the subdisciplines. Includes graphics that represent their relative size and relationship.

Numbers and Numerical Prefixes
Tables for Greek and Latin number values alone and as a part of other words.

F2 - Math Formula Finder
Produces equations that match the name of the formula from a list. Can add onto the selection. Uses MathML coding.

Geometry Formulas and Facts
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.

Wikipedia: Mathematics Section
Free encyclopedia. Cover number systems, different math fields, foundations, history, applications, and famous problems.

Wolfram: Mathematical Functions
Includes advanced formulas and visualizations of various equation, such as elliptical curves.

The Math Reference Project
An electronic archive of articles by Karl Dahlke on topics ranging from high school geometry up to graduate level topology.

The Abacus
Articles on the the history, techniques, and contruction of the abacus, with interactive Java Applet.

Glossary of Math Terms
Explains commonly used words specialized to this field. Includes examples and some graph illustrations.

On-Line Encyclopedia of Integer Sequences
Identify a sequence by entering few terms in the sequence. Additional information includes examples, formulas, and related links.