This is a collection of links to articles and resources concerning mathematics that I have found useful and interesting.

Paul Dawkins Notes from Lamar University College Algebra, Trigonometry, Calculus I, Calculus II, Calculus III, Differential Equations, Linear Algebra
Chicago undergraduate mathematics bibliography Reviews of the most commonly used textbooks for various courses in a typical mathematics department.
Euclid’s ‘Elements’ Redux A modern and highly readable version of one of antiquities most important documents.
Cut The Knot Miscellaneous Mathematics learnings and puzzles
Fermat’s Library This site highlights a classical paper in mathematics and features community annotations. A new paper every week.
NIST Dictionary of Algorithms and Data Structures This site includes many curiosities including an explanation of how to compute square roots by hand.
HAKMEM Various mathematical miscellany that range from useful to simply interesting.
Colin Wright’s Blog An interesting blog on a variety of mathematical topics.
GeoGebra Dynamic algebra and geometry modeling in the browser.