n-categorical point of view André Joyal, CatLab, a wiki project dedicated to the exposition of categorical mathematics formal introduction to category theory. J. Adamek, H. Herrlich, G. Stecker, Abstract and Concrete Categories-The Joy of Cats Stanford Encyclopedia of Philosophy: "Category Theory"—by Jean-Pierre Marquis. Extensive bibliography. List of academic conferences on category theory Baez, John, 1996,"The Tale of n-categories." An informal introduction to higher order categories. WildCats is a category theory package for Mathematica. Manipulation and visualization of objects, morphisms, categories, functors, natural transformations, universal properties. The catsters, a YouTube channel about category theory. Video archive of recorded talks relevant to categories, logic and the foundations of physics. Interactive Web page which generates examples of categorical constructions in the category of finite sets. Category theory Property