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.

Luke Alford

Short code implementation of <a href="https://kazzkiq.github.io/CodeFlask.js/" rel="nofollow ugc">Codeflask</a>
Usage
[codeflask language=”langused” title=”title of file or what ever!”]
code goes here
[/codeflask]
You are required to set both these attributes.
Current attributes
language = type of syntax.
title = title of editor.
Demo
You can view it working on wordpress <a href="http://lukealford.me/portfolio/codeflask-for-wordpress/" rel="nofollow ugc">here</a>

WordPress Code Snippet vs IDE Micro code-editor