WP Code Highlight provides clean syntax highlighting and it also provides a code button.
Plugin Tag: sourcecode
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WP SyntaxHighlighter
This plugin is code syntax highlighter based on SyntaxHighlighter ver. 3.0.83 and 2.1.382.
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Pastacode
Use Pastacode to add code into your posts with the awesome PrismJs coloration library. So, past'a code!
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SyntaxHighlighter Evolved
Easily post syntax-highlighted code to your site without having to modify the code at all. As seen on WordPress.com.