gerrygooner

This WordPress plugin will cleanup your WordPress database, performing the following actions:
<ul>
<li>Remove all post revisions.</li>
<li>Remove all spam comments.</li>
<li>Remove all unapproved comments.</li>
<li>Remove all unused tags.</li>
<li>Remove all unused post meta.</li>
<li>Optimize MySQL tables by removing all unused table space.</li>
</ul>
Based on WP-Cleanup by JortK, this plugin replaces usage of mysql_query() that was deprecated in PHP 5.5 with WP_Query functions .

WP-CleanDB

multinetgmbh

Why show the “Comments” link in the admin menu when you’re only running a small corporate website, or why add css classes you don’t need to your menu items? This plugin lets you easily disable some stuff WordPress adds by default.

Simple Cleanup

Provides options to clean up your WordPress backend and the generated HTML source of your website.

WP-CleanDB vs Simple Cleanup