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A Gentle Introduction to Category Theory  Lecture notes by Maarten M. Fokkinga introducing some important notions from category theory, in particular adjunctions. Proofs are given in a calculational style, and the (few) examples are taken from algorithmics. The text is a long PostScript file.
ATCAT (Atlantic Category Theory Seminar)  Dalhousie University in Halifax, Canada.
Applied and Computational Category Theory  A brief description of category theory, and some useful links.
Catacomb  Categories and Combinatorics Group at the University of Sydney.
Categorical Geometry Homepage  Online books and research papers on categorical algebra, categorical logic, categorical geometry, lattice theory, universal algebra and algebraic geometry.
Categorical Myths and Legends  An archive of stories about category theorists.
Categories Home Page  Web page for the category theory mailing list.
Categories at Coimbra  Members, meetings, reports, resources.
Categories, Quantization, and Much More  Introductory article by John Baez.
Category Theory  This expository article is an entry in the Stanford Encyclopedia of Philosophy.
Category Theory  This expository article is an entry in the Stanford Encyclopedia of Philosophy.
Category Theory Research Center  Announcements of weekly seminars, conferences, and other research activities in category theory based in Montreal, Canada.
Category Theory Research Center MontrĂ©al  Timetable.
Category Theory and Homological Algebra  In the "known maths" series.
Computational Category Theory Project  The aim of this project is the development of software on a wide variety of platforms for computing with mathematical categories and associated algebraic structures.
Descent and Category Theory Connections  Maintained by M. Alsani.
Katmat  Research Group on Categorical Methods in Algebra and Topology, University of Bremen. German/English site.
Linear Logic in Computer Science  European TMR research network.
Open Problems on Model Categories  Problems on model categories listed by Mark Hovey at Wesleyan University.
Paul Taylor's Home Page  Includes papers on category theory.
