Geometric Topology  
   Numerous links in the Geometry Junkyard.
   http://www.ics.uci.edu/~eppstein/junkyard/topo.html

xxx Math Front: GT Geometric Topology  
   Preprints in geometric topology in the Arxiv.
   http://front.math.ucdavis.edu/math.GT

Manifolds and Cell Complexes  
   Section 57 in Dave Rusin's Mathematical Atlas.
   http://www.math.niu.edu/~rusin/known-math/index/57-XX.html

The Optiverse and Other Sphere Eversions  
   Article by John M. Sullivan on sphere eversions, with numerous illustrations.
   http://www.math.uiuc.edu/~jms/Papers/isama/

3-Manifolds  
   Links to low-dimensional topology resources.
   http://www.math.unl.edu/~mbritten/ldt/3mfld.html

Crystallographic Topology  
   The Topology of Crystallographic Groups and Simple Crystal Structures
   http://www.ornl.gov/sci/ortep/topology.html