New York Group Theory Cooperative - Software (Magnus), preprints, meetings, links. Magnus - a graphically-oriented system for computational group theory - allows one to explore and experiment with abstract groups without the need for learning yet another programming language. Magnus is freely available software (GPL) based on Tcl/Tk.

Group Pub Forum Home Page - These are the community pages for Group Theory, the mathematics of symmetry. Group Theory is a branch of algebra, but has strong connections with almost all parts of mathematics.

Open Problems in Group Theory - This is a part of the Magnus project. Contains over 150 problems in group theory, both well known and relatively new. Great for graduate students.

Symmetric Presentations - Some presentations of groups (symmetric or otherwise).

People in Geometric Group Theory - List of scholars in the field of Geometric Group Theory.

Topological Methods in Group Theory - Table of contents only; draft chapters can be downloaded by arrangement.

Introduction to Group Theory - A fairly easy to understand tutorial. Fourteen sections, including groups, Cayley tables, subgroups, cosets, Lagrange's theorem, cyclic groups and subgroups, permutations, and Rubik's cube.

Coxeter/Weyl Tutorial - A Tutorial Introduction to the Coxeter and Weyl Packages, a pair of Maple packages for working with root systems, finite Coxeter groups and Weyl characters

Symmetry Groups in Maple V - A worksheet by W.D. Joyner.

International Society for Group Theory in Cognitive Science - Group theory in: Robotics, Problem-Solving, Planning, Learning, Language, Perception, Art, Design, Engineering, Manufacturing, Epistemology, Measurement, Computation, Neuroscience, Anthropology, Semiotics.

Mod-2 Cohomology of 2-Groups - Computer calculation of the mod-2 cohomology of groups of order 8, 16, 32 and 64.

GAP - Groups, Algorithms and Programming - GAP is a free system for computational discrete algebra.

The Moonshine Page - Bibliography, meetings.

Permutation Group Problems - Compiled by Peter Cameron.

Semigroup Theory - Directory of home pages and conferences maintained at Southampton University.

Symmetry - The main point group symmetries of interest to defect physics by operation (reflection, rotations etc) and classification (trigonal, cubic etc). Most point groups also have the associated character table on-line.

Permutation Groups Resources - Web-based resources for permutation groups and related areas in group theory and combinatorics.

The North British Quantum Groups Collective - The North British Quantum Groups Collective meets regularly to discuss research in quantum groups, with the aim of disseminating recent results and exchanging ideas and information on the subject.

Introduction to Group Theory - In the "Dog" school. A web-based text.

Field Arithmetic Archive - This archive stores electronic preprints on the arithmetic of fields, Galois theory, model theory of fields, and related topics.

Papers by R. E. Borcherds - Including proof of the Moonshine Conjecture (TeX, DVI, PDF).

Trinomials with Interesting Galois Groups - Parametrisation of trinomials with Galois groups contained in the simple group G168.

What is Moonshine? by Richard Borcherds - A multimedia web seminar: slides and audio.