http://www.numbertheory.org/

Maintained by Keith Matthews, University of Queensland.

http://www.fer.hr/

Department of Applied Mathematics. Staff research interests, photograph.

http://www.math-inst.hu/

Hungarian Academy of Sciences, Budapest.

http://www.sissa.it/

Sectors include mathematical physics, functional analysis and statistical mechanics.

http://www.lumii.lv/

Institute of Mathematics and Computer Science.

http://www.imar.ro/

Institute of Mathematics.

http://www.keldysh.ru/

Keldysh Institute of Applied Mathematics

http://www.saske.sk/

Mathematical Institute; Extension in Kosice.

http://www.uned.es/

Departamento de Matemáticas Fundamentales.

http://www.mittag-leffler.se/

The Royal Swedish Academy of Sciences.

http://lsgnt.org/

LSGNT is a joint venture of Imperial College, King's College London and University College London with funding from EPSRC as a Centre for Doctoral Training.

http://uwc.edu/

Department of Mathematics.

http://www.commalg.org/

A site for the commutative algebra community, including news, conference and preprint announcements, and a huge list of algebraists.

http://www.tony5m17h.net/

Includes generalizations, and algebraic geometry. Notes and links by Tony Smith.

http://www.algebrahelp.com/

Nice collection of algebra lessons, calculators and worksheets.

http://www.jamesbrennan.org/

Covers the order of operations, working with plus and negative signs, solving for unknowns, straight line and polynomial functions, cartesian coordinates and simultaneous equations. Includes topical navigation, illustrations and charts.

- WebMath
- A

http://www.webmath.com/

A set of tutorials on various topics in introductory mathematics, as well as free software.

http://www.purplemath.com/

Includes illustrated tutorials, categorized links, homework guidelines, and a study skills survey.

http://www.alphaquark.com/

Gives a geometric proof of the rule for measuring the sides of a right triangle.

http://www.brightstorm.com/

Offers free math problem solving videos in algebra, geometry, algebra 2, trigonometry, precalculus, and calculus. Homework checker with answers to specific math problems.

http://www.emathhelp.net/

A collection of pre-algebra notes with examples and exercises.

http://mathfraction.com/

Offers lessons to teach or refresh old algebra skills, software that shows how to solve problems step-by-step, and interactive worksheets for testing skills.

http://www.algebrahouse.com/

Offers help and insight on a variety of algebra topics. Includes detailed notes, previously answered questions.

http://www.basic-mathematics.com/

Covers arithmetic, basic geometry, algebra, and some math games.

http://www.math-aids.com/

Automatically generated worksheets.

http://www.paultaylor.eu/

Includes papers on category theory.

http://www.algebrafunsheets.com/

Algebra worksheets that integrate math skills with puzzles and games. Includes access to free samples.

http://clifford.org/

Includes an abstracts mailing list, information on events and back copies of the journal "Advances in Applied Clifford Algebras".

http://www.perwass.de/

Aims to produce tools for use with Clifford algebra. Includes information on the visualisation libraries and calculators produced, as well as downloads.

http://www.gap-system.org/

GAP is a free system for computational discrete algebra.