nscerqueira are the initials of: Nuno Sousa Cerqueira.
I've used tcl/tk for quite a while and now I am quite addicted to it. I generally develop tcl/tk GUIs for theoretical and computational chemistry.
Lately I have been using it together with VMD (Visual molecular dynamics) that uses tcl as the main scripting language.
Have a look at some scripts that I have develop: