Differential Equations on the Web

Indices:

Ordinary Differential Equations: Index of ODE links from the American Mathematical Society.
Dynamical Systems: Index of Dynamical Systems links from the American Mathematical Society.
Math Forum Internet Resource Collection: Ordinary Differential Equations.
Software for Differential Equations from the Math Forum: ``This list contains what we feel is some of the best differential equations software.''
Resources for a Modern Differential Equations Course by H.J. Ricardo, Medgar Evers College (CUNY).
DiffEQ Resource Center Online source for teachers and students of differential equations.

Class Pages at other Universities:

Math 462 at the University of New Mexico: Introduction to Ordinary Differential Equations. A set of homework problems with solutions in postscript format by T.M. Kapitula.
Math 341 at the University Illinois at Urbana-Champaign: Rigorous introductory ODE class, by R.G. Muncaster.
Several advanced ODE classes by G. Kovacic at RPI.
Class notes for an introductory ODE class by W. Boyce at RPI.
Math 511 at Penn State University: Advanced ODE class by H. Weiss. Also uses the book by Verhulst.
Math 848 at Michigan State University: Class notes for a graduate ODE class by S. Newhouse.
Math 308 at Texas A&M University: One of the most comprehensive collections of material for an introductory ODE class, the computer labs are based on Maple.
NWU Differential Equations Resource Page: Teaching materials from the Nebraska Wesleyan University. Mainly for an introductory class, but some useful links and hints about Mathematica.

Mathematica Resources:

Wolfram Research, the makers of Mathematica.
MathSource: An electronic library of Mathematica material maintained by Wolfram Research.
MathGroup, an e-mail group for Mathematica users. Also maintains a list of Mathematica related links.
Interactive Learning in Calculus and Differential Equations from Indiana University of Pennsylvania.
ODE Laboratories: Lots of material for an introductory class on differential equations with Mathematica by C.A. Barker at San Joaquin Delta College.
Introduction to ODEs with Mathematica: A book by Gray, Mezzino, and Pinsky. The book is obviously not online, but the contents of the accompanying CD is. Again, the material seems targeted at an introductory rather than an upper division course.
Lecture Labs in Ordinary Differential Equations: Mathematica notebooks for differential equations by S.R. Dunbar keyed to the textbook "Fundamentals of Differential Equations, Third Edition" by Nagle and Saff.