FQL. Functorial query
language. Build your own categories, functors, and database
instances, and
push them around with data migration functors. (Joint
with Ryan Wisnesky).
Category theory book
MIT
Press has published "Category theory for the sciences". The book can
also be purchased on
Amazon.
Here are reviews by
the MAA, by
the
AMS, and by
SIAM.
Free
HTML version: not as nice to read, but
free to the world, on the MIT
Press website. An older
version, entitled "Category theory for the scientists", can be found
here.
Derived manifolds. The
category of derived manifolds contains arbitrary intersections of
manifolds, even if they are not transverse, while retaining enough
structure so that every compact derived manifold has a fundamental class
in cobordism.
Miscellaneous files Includes
some papers of mine and others (some brief or unfit for publication, but
possibly of interest), a program for doing calculations in a group-ring,
some LaTeX guides I use, and other random stuff.