EnglishMike

<blockquote>
<blockquote>
Important Note: The recent release of WordPress 2.6 has fixed the disappearing entities bug this plugin was designed to fix, so once you upgrade to WordPress 2.6 please discontinue using this plugin. I may release a new plugin that prevents spaces from being stripped from the beginning of lines sometime in the near future.
</blockquote>
</blockquote>
After a few weeks of writing posts on WordPress, I was getting very irritated when all the HTML entities I added to my examples kept being converted into characters — e.g. HTML entities like &gt; &lt; &quot; would convert to > < " — when I saved the post I was working on.
To make matters worse, all the spaces I was using to align my coding examples would disappear when switching between “HTML” mode and “Visual” mode, even if I used the &nbsp; entity.
So, I finally bit the bullet and wrote this little plugin to fix these problems. It does just two things:
<ol>
<li>Allows you to enter HTML entities like &gt; &lt; &amp; etc. while in “Visual” mode and they will stay put, even after you save your post.</li>
<li>Allows you to type extra spaces while in “Visual” mode (or &nbsp; in “HTML” mode) and they will stay put too, allowing you to correctly indent code samples, etc. </li>
</ol>
If you are writing blog posts with source code or HTML examples, you may find this little plugin helps you avoid a ton of aggravation.
Works with TinyMCE and the TinyMCE Advanced plugin.
Please note, this plugin is a patch for issues with WordPress’s uses of TinyMCE, and not the editor itself.
If you try this plugin and like what you see, or you have questions or problems, feel free to email me at mike@englishmike.net or visit the <a href="http://englishmike.net/tinymceentities-plugin/" rel="nofollow ugc">TinyMCE Entities Patch Plugin Home Page</a> with your feedback.
(Not tested on any version of WordPress older than 2.5.1. It may work on earlier versions, but I just don’t know for sure. Try it and see. If it doesn’t work simply deactivate the plugin. If it does work, please let me know!!)
<h3>Release Notes version 1.0</h3>
Changes in version 1.0
<ul>
<li>This is the initial version of the plugin.</li>
</ul>

TinyMCE Entities Patch

Prevent spaces and HTML entities (e.g. &gt; or ') from disappearing when editing posts with TinyMCE.

Fidgety Lizard

Kona Macphee

Email notifications sent by bbPress will sometimes include unwanted HTML entities, particularly in the email subject but sometimes in the email text as well.
For example, a forum topic as follows:
<pre><code> My thoughts & objections
</code></pre>
might come through with an email subject as follows:
<pre><code> My thoughts &amp; objections
</code></pre>
There is a fix for this marked “under consideration” in the bbPress bug tracking system: 
<a href="https://bbpress.trac.wordpress.org/ticket/2865" rel="nofollow ugc">https://bbpress.trac.wordpress.org/ticket/2865</a>
In the meantime, this plugin implements a version of the suggested fix. (Props to @thebrandonallen for the patch code.)
IMPORTANT NOTES:
This plugin only works with bbPress 2.5.8 or later.
If you’re using other plugins that affect how bbPress sends emails, then this plugin may not solve your HTML entities issues.

Fix Forum Emails

Fixes unwanted HTML entities in bbPress notification email subject lines and message bodies.

TinyMCE Entities Patch vs Fix Forum Emails