Geshi is a free software library that allows syntax highlighting of source code for several markup and programming languages.
GeSHi ("Generic Syntax Highlighter") is a free software library that allows syntax highlighting of source code for several markup and programming languages. The program is written in PHP and is bundled or available as an add-on in popular web-based applications, such as Dokuwiki, Mambo, MediaWiki (see extension), phpBB and WikkaWiki.