Alexandre Stefanov has long maintained a list of online math texts and other materials at Geocities; this material has now been moved to 110MB Hosting. Because these resources may be of interest to our readers, we present here a modified version of Stefanov's list as of November 18, 2009.

Fractals

• Fractals in the Plane - the Ergodic Theory Methods, by F. Przytycki and M. Urbanski
• Lecture notes in Conformal Dynamics, taught by Curt McMullen.
• Fractals, by Dr. P. G. Dixon

Graph Theory

• Graph Theory with Applications, by J.A. Bondy and U.S.R. Murty
• Graph Theory, by Reinhard Diestel (printing disabled)
• Interactive Graph theory tutorials, by Chris K. Caldwell (must register to use)

Coxeter groups

• Mirrors and Reflections: The Geometry of Finite Reflection Groups, by Alexandre V. Borovik, Anna S. Borovik
• Miscellaneous facts about Coxeter groups, by Robert B. Howlett
• Buildings, BN-pairs, Hecke algebras, classical groups, by Paul Garrett

Nielsen Fixed Point Theory

• Ross Geoghegan's Home Page, has a set of papers

Permutation Puzzles

• Mathematics of Rubik's cube, by David Joyner is a good source for discrete group theory with applications to permutation puzzles.