SyntaxHighlighter - Fully functional self-contained code syntax highlighter developed in JavaScript

SyntaxHighlighter is THE client side highlighter for the web and web-apps! It's been around since 2004 and it's used virtually everywhere to seamlessly highlight code for presentation purposes. SyntaxHighlighter is currently used and has been used in the past by Microsoft, Apache, Mozilla, Yahoo, Wordpress, Bug Labs, Freshbooks and many other companies and blogs.