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

fedmich

This plugin will help you hide the default WordPress dashboard widgets like Incoming Links, etc. 
And also adds a Quick Menu Finder on your dashboard which would help save some time finding those menus that are deeply nested under a submenu.
You can also remove the Akismet Stats from your Dashboard Menu, Theme Editor, Plugin Editor, Custom Background, Custom Header as well.
<a href="http://fedmich.com/tools/dashboard-menus-cleaner" rel="nofollow ugc">Dashboard & Menu Cleaner</a> built by <a href="http://fedmich.com" rel="nofollow ugc">Fedmich</a>
<h3>More Info</h3>
Send your suggestions and comments on <a href='http://www.fedmich.com/tools/dashboard-menus-cleaner' rel="nofollow ugc">fedmich.com/tools/dashboard-menus-cleaner</a>
Thanks

Dashboard & Menu Cleaner (Quick Menu Finder)

This plugin will help you hide the default WordPress dashboard widgets like Incoming Links, etc.

WP-CleanDB vs Dashboard & Menu Cleaner (Quick Menu Finder)