"tcltidy ... puts tidy in a callable dll library." [L1 ]
http://tidy.sourceforge.net/ is the current home page for Tidy, a program that processes HTML and either makes suggestions about changes to the HTML, makes some changes, or even converts the HTML into XML.
http://www.w3.org/People/Raggett/tidy/ is the original author's home page for tidy.
http://tidy.atari.org/ is a port of Tidy to the Atari computer.