W3.org:

W3.org has 287 URLs listed in 163 Dmoz categories.

W3C Internationalization and Localization
The W3C tries to make sure that WWW technology meets the needs of the global community.
http://www.w3.org/International/
Top/Computers/Software/Globalization/Internationalization

Jigsaw 2.0.4
A public release, made on January the 21th, 2000 - New features includes Charset support.
http://www.w3.org/Jigsaw/RelNotes.html
Top/Computers/Software/Globalization/Internet/Servers/WWW/Jigsaw

W3C Internationalization and Localization
Modern business, research, and interpersonal communication is conducted in many writing systems and languages. The W3C tries to make sure that WWW technology meets the needs of the global community.
http://www.w3.org/International/
Top/Computers/Software/Globalization/Internet/Web_Sites

XML Japanese Profile
This W3C note addresses the issues of using Japanese characters in XML documents. In particular, ambiguities in converting existing Japanese charsets to Unicode are clearly pointed out.
http://www.w3.org/TR/japanese-xml/
Top/Computers/Software/Globalization/Language_Specific/CJKV/Japanese

W3C Internationalization/localization: HTML
Information about internationalization and localization of web sites. Part of the World Wide Web Consortium's site.
http://www.w3.org/International/O-HTML.html
Top/Computers/Software/Globalization/Localization

W3C Internationalization and Localization
The World Wide Web Consortium's Localization/Internationalization working group web pages.
http://www.w3.org/International/
Top/Computers/Software/Globalization/Programming_Languages/HTML

Unicode in XML and other Markup Languages
This document contains guidelines on the use of the Unicode Standard in conjunction with markup languages such as XML.
http://www.w3.org/TR/unicode-xml/
Top/Computers/Software/Globalization/Programming_Languages/XML

HTML Generation
Various conversion scripts from the World Wide Web Consortium.
http://www.w3.org/Tools/HTMLGeneration/
Top/Computers/Software/Internet/Authoring/Converters

HTML Tidy
Unix, Windows, MacOS, and others. Validator fixes errors in HTML and XHTML. Converts HTML to XHTML. Free Software.
http://www.w3.org/People/Raggett/tidy/
Top/Computers/Software/Internet/Authoring/HTML/Validators_and_Lints

Amaya
W3C's open source browser/editor for testing and evaluating new standards. Supports XHTML, MathML, SVG and CSS.
http://www.w3.org/Amaya/
Top/Computers/Software/Internet/Clients/WWW/Browsers