Includes archived stories on category theorists.

Includes archived postings, list of conferences, mailings lists, TeX macros for diagrams as well as links to related websites and the theory and Applications of Categories journal.

Article written by John Baez.

Includes general definitions, examples and applications, history, and philosophical significance.

Implementation of concepts and constructions using Standard ML. Includes full details of the project in pdf or postscript, and access to the programs used.