TraceyText’s home page is http://traceytext.sourceforge.net
The best way to see it in action are the source stepping demo and the picture slideshow demo. The demo runs through the Dragon Realm game from my book that teaches Python programming. You can either create these web pages with TraceyText by hand, or use the included TraceyText Python script to create a source file that generates the web page.
I created this tool as a way to demonstrate how programs run line by line, and what it outputs and the state of the varaibles. Simple text was way too verbose, and video would have taken too much bandwidth. In addition, TraceyText makes for a very nice and simple HTML slideshow.