Algebraic Topology
In Dave Rusin's Mathematical Atlas.

Surgery Bits and Pieces
Assembled by Andrew Ranicki.

Math Front: AT Algebraic Topology
Preprints in algebraic topology.

Algebraic Topology Discussion List
Information on subscribing, archives of past discussions, and links to home pages of algebraic topologists.

Hopf Topology Archive
A preprint archive in algebraic topology.

Algebraic Topology and Concurrency
Applications of algebraic topology to computer science.

The Hopf Fibration
Notes and pictures of the Hopf map from S3 to S2.

Algebraic Topology by Solomon Lefschetz
Published by the AMS, available for free download as PDF files.

Algebraic K-Theory, Linear Algebraic Groups and Related Structures
TMR network coordinated in Bielefeld.

An Introduction to Algebraic K-theory
A graduate textbook, some chapters online, by Charles Weibel.

Modern Homotopy Theory
Research Training Network supported by the European Commission.

Allen Hatcher's Homepage
Contains textbooks in Algebraic Topology, K-Theory, and 3-Manifolds.

K-theory
From the atlas of known mathematics.

Modern Homotopy Theory
An EU Research Training Network. Positions, workshops, conferences, research agenda.

Open Problems in Algebraic Topology
Problems in algebraic topology, listed by Mark Hovey, mathematician at Wesleyan University.

Ext Charts
Ext charts for modules over the odd-primary Steenrod algebra by Christian Nassau.

Table of the Homotopy Groups of Spheres
From Toda's book: Composition Methods in Homotopy Groups of Spheres.

Higher Dimensional Group Theory
An article on how the theory of abstract groups may be generalised to higher dimensions than 1 by Ronald Brown, Bangor.

Algebraic K-theory, Groups and Categories
Report of a research programme at the University of Wales, Bangor.

MathWorld
Index to articles on Algebraic Topology.

Novikov Conjecture Home Page
The latest developments concerning the Novikov Conjecture and related problems in topology, geometry, algebra, and analysis. Maintained by Jonathan Rosenberg.

What is Algebraic Topology?
Introductory essay by Joe Neisendorfer, University of Rochester.