In this section:

About Mathematica

Mathematica and economics

Tips and tricks

About us Mathematica: Links and Downloadable Code

I have limited this list to substantive code in Mathematica available for free. I have excluded commercial packages. Please email me if you know of a good site that I have not included.

Paul Abbott, and University of Western Australia
Collection of useful notebooks (FTP server)
Oliver Ruebenkoenig, University of Freiburg
IMTEK Mathematica Supplement: a substantial free add-on to Mathematica, including for differential equations, graphics and interfaces with external formats
David Barnes, Washington State University
Orthogonal series (eg Bessel functions), Wave equations, Fourier series and Laplace transforms
Mitchell Berger at University College, London
Code for producing knots and braids
Christian Damgaard, Danish National Environmental Research Institute
Lorenz curves and Gini coefficients (scroll to bottom)
Murray Eisenberg, University of Massachusetts
Mathematics course materials and other code
David Eppstein, State University of New York at Stony Brook
Knuth-Morris-Pratt Algorithm and Minkowski sum code
Carsten Franke, University of Göttingen
Downloadable code
Selwyn Hollis, Armstrong University
Pages on Mathematica, calculus and some gorgeous Mandalas
Arthur Kuo, University of Michigan
Various engineering applications
U Mist, UK (University of Science and Technology in Manchester)
Fuzzy clustering notebooks
Michael A Morrison, Oklahoma University
Links, tips, tricks and techniques
David Park
Packages for graphics, unit conversion, and the Through command
Rudy Rucker, San José State University
KappaTau space curves
University of California at San Diego’s Mathematics Department
Tutorials and packages for Non-Commutative Algebra
Analytic Optimisation Software
University Karlsruhe
FeynArts Mathematica package for the generation and visualization of Feynman diagrams and amplitudes
University of Toronto
Computing Galois groups