Counterexamples in Clifford Algebras
Pertti Lounesto refutes propositions in the recent literature on Clifford algebras, spinors, spin groups and exterior algebra.

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

Geometric Algebra and its Applications in Mathematical Physics
C.J.L. Doran's thesis on applications of Clifford algebras. Downloadable in PostScript format.

Advances in Applied Clifford Algebras
This journal publishes research papers and notes, expository and survey articles, book reviews, reproduces abstracts and also reports on conferences and workshops in the area of Clifford Algebras and their applications to other branches of mathematics and physics, and in certain cognate areas.

Cinderella
A series of Java applets for illustrating principles of this formalism.

CLICAL for Clifford Algebra Calculations
Includes an introduction and examples of how to solve problems using this Maple package, as well as downloads of the software.

Clifford
A Maple package for computations in Clifford algebras of an arbitrary bilinear form. Includes documentations of new features and installation information, as well as downloads of the software.

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

GABLE: A Matlab Geometric Algebra Tutorial
Includes downloads of the program and tutorial text, as well as slides of a presentation.

Gaigen
A program for generating implementations of this mathematical formalism. Includes an introduction, documentation and downloads.

Geometric Calculus Research and Development
Includes a brief introduction, articles and book chapters on the subject, as well as references to further information.

Maths for (Games) Programmers: Multivector Methods
An introduction on this formalism and its applications in space-time.

Advances in Applied Clifford Algebras
Electronic version of the journal published by the Universidad Nacional Autónoma de México. Publishes original research papers, expository and survery articles, book reviews, reproduces abstracts and reports on conferences and workshops in the area of Clifford Algebras and their applications.

GA-Net
Free electronic newsletter on Clifford algebra and geometric algebra. Archive, free subscription functions and submission information.

ICCA7
7th International conference on Clifford Analysis and their applications in Mathematical Physics. Université Paul Sabatier, Toulouse, France; 19--29 May 2005.