Allan Collins

This plugin will allow you to add code snippets to your pages/posts. This is great for code tutorial sites.
<h3>Upgrading</h3>
If you are upgrading from version 1.0, you will see an option on the Code Library page that will allow you to upgrade. As a precautionary measure, be sure to back up your database before doing so.

WordPress Code Snippet

This plugin will allow you to add code snippets to your pages/posts.  This is great for code tutorial sites.

rahburma

This is a syntax highlighter plugin which also acts as an interface to the online compiler api service on cloud provided by https://www.compilebin.com. It interacts with cloud service via rest APIs i.e, submit the code and get the output. Users need to signup and get an api key which is to be updated in the plugin to use the service. Plugin contains a link for signing up for the service. There is no security concern on the web server as the task of code execution is offloaded to the cloud service. The plugin uses the following open source libraries : 
1) Code prettify for syntax highlighting 
2) Ace code editor 
Please visit https://www.compilebin.com for more information about the service. 
Note that this plugin can also be used purely as a syntax highlighter only by hiding the run button on your code snippets. This mode of usage is free of any charges. Run button will not be visible on public view. 
Please report issues to support@compilebin.com 
This plugin is actively maintained and we will fix the reported issues as soon as possible.

Compilebin

An online compiler plugin which comprises of code editor and live compiler along with syntax highlighter.

WordPress Code Snippet vs Compilebin