TITLE: Applications of Category Theory Outside of Mathematics (the discipline)
QUESTION [6 upvotes]: I apologize if this is off-topic, but I wish to know what applications have other disciplines made of category theory. I have heard that linguistics, computer science, and philosophy all make use of category theory. But due either to my own lack of familiarity with category theory or these disciplines, I'm rather ignorant of these applications.
So, what (fruitful) uses have been made of category theory, especially within philosophy, but within other academic disciplines as well?

REPLY [2 votes]: For philosophy, you could read the article on the Stanford Enciclopedia of Philosophy.

Category theory challenges philosophers in two ways, which are not necessarily mutually exclusive. On the one hand, it is certainly the task of philosophy to clarify the general epistemological and ontological status of categories and categorical methods, both in the practice of mathematics and in the foundational landscape. On the other hand, philosophers and philosophical logicians can employ category theory and categorical logic to explore philosophical and logical problems.

This is the beginning of the third section (named philosophical significance) of the article I mentioned. I hope it to be useful for you.