Alex Mansfield

This plugin allows you to easily add code to your pages and posts without worrying about what the WordPress editor will do to it. You can embed HTML, video embed codes, Paypal forms, Google maps and more. Please note: this plugin will not allow you to run server side scripts such as PHP.
To use the plugin, all you have to do is create a custom field (you can name it anything), place your code in the new custom field, and place the following shortcode into your post where you want the code to go:
<pre><code>[easyembed field="name-of-custom-field"]
</code></pre>

Easy Embed

Allows any code to be easily embedded in posts and pages.

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English:
This plugin to select blocks of code takes advantage of JavaScript-library ‘google-code-prettify’. If it is for his work simply insert frame <pre> tag with class ‘prettyprint’.
*** Tip: In order to optimize the use of resources, try to use only one option – ‘Automatically replace the tags <pre> to <pre class=”prettyprint linenums”> before saving post.’
Russian:
Данный плагин для выделения блоков кода использует возможности JavaScript-библиотеки ‘google-code-prettify’. При это для его работы достаточно просто обрамлять вставки тегом <pre> с классом ‘prettyprint’.
***Совет: в целях оптимизации потребления ресурсов старайтесь использовать только 1 флажок – ‘Автоматически заменять <pre> на <pre class=”prettyprint linenums”> перед сохранением записи.’

Code Prettify Syntax Highlighter

Highlighting the code in the post with JavaScript library «google-code-prettify».

Easy Embed vs Code Prettify Syntax Highlighter