1)   CSE HTML Validator Professional 8.04
CSE HTML Validator Professional is a fast, powerful, user configurable, and easy to use professional web development tool that helps you create syntactically correct and accessible HTML, XHTML, and CSS. Can automatically fix HTML. Also checks links.

 2)   CSE HTML Validator Lite 8.04
CSE HTML Validator Lite is a fast, easy to use, and FREE (for personal and educational use) HTML development tool for Microsoft Windows that helps you create problem-free HTML and XHTML documents. It's also a great learning tool.

 3)   WebColor 227
Never accidentally use non-websafe colors again. WebColor is your own personal HTML pocket-palette! Don't do HTML without it!