nscerqueira are the initials of: Nuno Sousa Cerqueira
I've used tcl/tk for quite a while and I now I am quite addicted to it. I generally develop tcl/tk GUIs for theoretical and computational chemistry.
Lately I have been using together with VMD (Visual molecular dynamics) program that uses tcl as scripting the main language.
Have a look at some applications I have develop:
Virtual screening woth VMD and Autodock : http://www.fc.up.pt/pessoas/nscerque/vsLab/vLab/HomePage.html
MADAMM - Flexible docking software :http://www.fc.up.pt/pessoas/nscerque/MADAMM.html