__Math Refresher__: This brief overview covers useful high-school math you may have forgotten. Includes basic formulas for sinusoid and logarithmic functions, a discussion of log scales, and discrete probability. Includes a list of recommended inexpensive reference books.

__Number Systems__: Decimal, binary, hexadecimal, with a discussion of conversion from one system to another. By William Stallings.

__Queuing Analysis__: A practical guide to an essential tool for computer scientists. By William Stallings.

__Math Help__: Get Free Math help and Free online Math tutoring. Master basic and advanced Math concepts and also get help with your Math homework from best Online Math tutor

__Theoretical Computer Science Cheat Sheet__: By Professor Steven Seiden. Ten pages of commonly used formulas and other useful information for computer scientists.

__Ask Dr. Math__An excellent source of information on many math area. The emphasis is on high school math but college-level math is also covered.

__The Mathematical Atlas__: A very large collection of articles about aspects of mathematics. Each article gives a basic introduction to the subject, applications and related fields, and selected topics. There are also many references to resources, both books and online, that discuss the topic in greater detail.

__Applied Mathematics__: Links to Math resources on the Web, organized by topic, plus by keyword search. The site also shows the level of mathematical background to read the materials.

__MathWorld__: By the makers of Mathematica. Extensive, useful collection of information.

__Math Tables and Formulas__: Tables featured include Trigonometric Identities, Derivatives, Indefinite Integrals, Common Integrals, and Binomial Coefficients and Formulas, among others. A search engine and links to other S.O.S. sites and the S.O.S. Mathematics Cyberboard (for posting questions) can also be found here.

__Math Reference Tables__: Excellent collection of downloadable math tables.

__Prime Mathematics Encyclopedia__: Large collection of entries on mathematical terms and concepts.

__Sage__This computer algebra/computer mathematics package has the power and flexibility of Mathematica, Maple, or MATLAB. It is open source, free, and platform-independent. If you master one math package, this is the one to pick.

__Home Page of William Stallings__