Universities, academic institutions etc.

Here are some important and popular (to me, at least) pages:

• The New England Complex Systems Institute;
• the Massachusetts Institute of Technology and its library;
• the home page of my former research group in Würzburg: Theoretical physics III;
• the page of the course in: Computational Physics - admittedly unspectacular when the course is not being taught.
• the page of the student representatives: the Fachschaft (or was it Phachschaft?), with department news, a guide to studying in Würzburg, and much more;
• the Cip-Pool that I co-administrated.
• the university library with Web-OPAC and more;
• the theory department in Magdeburg.

If you're bored, go and read a good paper. For example from these sources:

• the awesome preprint server babbage.sissa.it, alternatively de.arXiv.org;
• the Complexity Digest - weekly new articles from biology, neurology, physics and other sciences related to complexity.
• the Econophysics page ;
• various magazines: Phys. Rev. E , PRL und J. Phys. A.
• For literature research, the Research Index can be useful.