Allen Hatcher's Homepage: Links to online texts and papers (published and unpublished) on Algebraic Topology, K-Theory, and 3-Manifolds

Knots on the Web (Peter Suber): A collection of knotting resources on the web. Sections on knot tying, mathematical knot theory, knot art, and knot books

Papers on Knot Theory at arxiv.org.: Search for papers held at LANL with the word 'knot' in them

Topology and Geometry Software: A collection of educational, graphical and research software by Jeff Weeks