The Illinois Genetic Algorithms Laboratory. The Journal of Nonlinear Science Alife Online , a BBS at the Santa FE Institute. The sci.nonlinear usenet newsgrooup deals with nonlinear systems, chaos, etc. They have a list of answers to frequently asked questions in these topics. The CNAM of Paris has a Fractal Movie Archive and a Fractal Art Gallery .
Source code is available there.
Center for Nonlinear Dynamics at UT Austin Institute for Nonlinear Science at UCSD Nonlinear Dynamics Bibliography at the Phisics Department of the University of Mainz, Germany.