SyntaxHighlighter https://github.com/syntaxhighlighter/syntaxhighlighter

Google Code Prettify https://github.com/google/code-prettify

Highlight.js https://highlightjs.org/ https://github.com/isagalaev/highlight.js

Prism.js http://prismjs.com/

jQuery.Syntax http://www.codeotaku.com/projects/jquery-syntax/index

rainbow https://github.com/ccampbell/rainbow https://craig.is/making/rainbows