1. Crayon Syntax Highlighter
A Syntax Highlighter built in PHP and jQuery that supports customizable languages and themes. It can highlight from a URL, a local file or WordPress post text. Crayon makes it easy to manage Language files and define custom language elements with regular expressions.
2. Advanced Code Editor
3. WP Code Highlight
WP Code Highlight provides syntax highlighting of source code snippets and it is W3C valid. Wrap code blocks with and it provides a code button(HTML editor) to help you insert code in articles easily. You don’t need to specify the language since WP Code Highlight will guess, all languages are supported. You can put line numbers in your code if you need.
4. WP Syntax
WP-Syntax provides clean syntax highlighting using GeSHi supporting a wide range of popular languages. It supports highlighting with or without line numbers and maintains formatting while copying snippets of code from the browser. It avoids conflicts with other 3rd party plugins by running an early pre-filter and a late post-filter that substitutes and pulls the code snippets out first and then pushes them back in with highlighting at the end.
5. IG: Syntax Hiliter
iG:Syntax Hiliter allows you to post source code to your site with syntax highlighting and formatting (as seen in code editors, IDEs). You can paste the code as is from your code editor or IDE and this plugin will take care of all the code colouring and preserve your formatting. It uses the GeSHi library to colourize your code and supports over a 100 programming languages. Most common languages are included with the plugin and it includes drop in support for more languages used by GeSHi.
6. Syntax Highlighter Compress
7. Code Highlight
This plugin uses the Google Code Prettify Script to Highlight & Style Code. The plugin also adds styling to the existing pre Quick tag in your WordPress text editor, no shortcodes which look bad if you stop using the plugin.
8. Dev Formatter
9. Syntax Highlighter Evolved
10. Syntax Highlighter MT
This plugin works like many of the others that enable the use of the Syntax Highlighter tool. Dynamic plugin loading is now available as part of the Syntax Highlighter tool, making brush configuration obsolete.
11. PCSH – PastaCode and Syntax Highlighter
With PCSH (based on the Pastacode plugin), you can easily add code into your posts with the awesome SyntaxHighlighter js-library. You can insert source code into the post editor, from a file, or from webservices like GitHub, Gist, Pastebin or BitBucket. Webservices responses are cached in order to avoid too many HTTP requests.
12. Smart Syntax
Smart Syntax plugin automatically adds Google prettify syntax highlighting to the fenced code blocks in both content and comments. It’s made with Jetpack markdown in mind, which brings the power of markdown extra to WordPress and gives you an easy to use markdown syntax for fenced code blocks.