HTML

Outils

http://www.w3.org/Amaya

http://tidy.sourceforge.net
http://www.w3.org/People/Raggett/tidy
http://www.paehl.com/open_source/?HTML_Tidy_for_Windows

Discussions

http://en.wikipedia.org/wiki/Comparison_of_HTML_editors
http://reference.sitepoint.com/html