3-Manifolds
Links to low-dimensional topology resources.
Crystallographic Topology
The Topology of Crystallographic Groups and Simple Crystal Structures
Geometric Topology
Numerous links in the Geometry Junkyard.
Manifolds and Cell Complexes
Section 57 in Dave Rusin's Mathematical Atlas.
The Optiverse and Other Sphere Eversions
Article by John M. Sullivan on sphere eversions, with numerous illustrations.
xxx Math Front: GT Geometric Topology
Preprints in geometric topology in the Arxiv.