Xenu Link Sleuth
Popular free software for checking a site for broken internal or external links and creating a sitemap. See also: Xenu – official site
XHTML
Extensible HyperText Markup Language is a class of specifications designed to move HTML to conform to XML formatting. See also: W3C:…
XML
Extensible Markup Language is a simple, very flexible text format derived from SGML, used to make it easy to syndicate or format information using
technologies such as RSS. See also: W3C:…
