http://www.tjhsst.edu/ dhyatt/superap/basic.html
http://java.sun.com/docs/books/tutorial/ Java Tutorial
http://www.gtk.org/tutorial/ Gtk+ Tutorial
http://www.dci.clrc.ac.uk/Publications/Cookbook/ Tcl/Tk Cookbook Tutorial
http://www.pythonware.com/library/tkinter/introduction Python/ Tkinter Tutorial