Greg

This plugin provides a shortcode to selectively disable WordPress’ automatic formatting. Very useful for anyone looking to write some custom HTML, but doesn’t want to completely diasble wpautop.
<h3>Usage</h3>
Wrap any HTML content, or content for which you wish to disable formatting inside of the [noformat] shortcode, like this:
<pre>
[noformat]
<ul>
 <li>This content won't be
 formatted.
</li></ul>

You'll notice no automatic 's or 's are added within this shortcode.
[/noformat]
</pre>

No Format Shortcode

This plugin provides a shortcode to selectively disable WordPress' automatic formatting. Very useful for anyone looking to write some custom HTML …

Vishit Shah

This is very simple plugin to remove extra p and br tags in post and page editer
This plugin remove extra p and br tags from the_content, the_excerpt and widget_text_content.

Remove Blank P Tag

This plugin remove extra p and br tags from the_content and the_excerpt.

No Format Shortcode vs Remove Blank P Tag