if you use pgf/tikz in latex, you can do commutative diagrams pretty easily in a matrix style environment where you then indicate how to draw arrows between var

if you use pgf/tikz in latex, you can do commutative diagrams pretty easily in a matrix style environment where you then indicate how to draw arrows between various entries and such. It takes an hour or two of playing with to get a hang of the notation, but its pretty nice, despite its quirks