kb_unhammer

This is a very simple plugin for the default (TinyMCE) editor. It adds 
a button that puts in a paragraph which won’t get deleted by the 
linebreak-eater (the one that starts munching when you press 
“Publish”).

Empty Paragraph for TinyMCE Editor

Adds an editor button that puts in an empty paragraph which won't get deleted when you save.

ReynoldsTimJ

Use this to force line breaks into your posts and pages. It is simple. [br] will add a line break. It won’t be filtered out by TinyMCE.
There are no attributes. Not much else to see here. I couldn’t find a plugin that did this anywhere. Thought that was odd.
Example time!
If your text editor content looks like this:
<pre><code>Hello this is my 
[br]
example!
</code></pre>
The HTML will end up:
<pre><code>Hello this is my
 
example!
</code></pre>
Because the default styling of a paragraph tag adds an area of white space below it this may result in more of a break than you wanted. Solution:
<pre><code>Hello this is my [br] example!
</code></pre>
Which results in the following HTML:
<pre><code>Hello this is my example!
</code></pre>
Question/Comments: Please hit up the forum or drop me a line at Reynolds.TimJ+LinebreakPlugin@gmail.com

Line Break Shortcode

Use this to force line breaks into your posts and pages. It is simple. [br] will add a line break. It won't be filtered out by TinyMCE.

Empty Paragraph for TinyMCE Editor vs Line Break Shortcode