Includes papers on category theory.

Notes by Ronald Brown.

Maintained by Birant Ramazan. Address book, open problems, meetings, pictures, other resources.

An illustrated guide book by Eugenia Cheng and Aaron Lauda (PS/PDF).

An implementation of concepts and constructions from category theory in the functional programming language Standard ML. Documentation and code.

Section of the e-print arXiv dealing with category theory, including such topics as: enriched categories, topoi, abelian categories, monoidal categories, homological algebra.

An archive of stories about category theorists.

Web page for the category theory mailing list.

Problems on model categories listed by Mark Hovey at Wesleyan University.

Maintained by M. Alsani.