Elias Lackner

Upload Directory Cleaner scans through your WordPress upload directory searching for all files not being registered in your Media Library. After the scan, choose which files to delete from the list showing all unregistered files.
Features:
<ul>
<li>Archive Directory</li>
<li>Scan Directory (Settings: Exclude top-level directories and files from the scan or add custom ignore strings.)</li>
<li>Delete Files (Settings: Keep Thumbnails, Delete Empty Directories)</li>
</ul>

Upload Directory Cleaner

The UDC plugin allows you to scan and delete all unregistered files from your Wordpress upload directory.

boliquan

WP Clean Up can help us to clean up the wordpress database by removing “revision” “draft” “auto draft” “moderated comments” “spam comments” “trash comments” “orphan postmeta” “orphan commentmeta” “orphan relationships” “dashboard transient feed”. 
It allows you to optimize your WordPress database without phpMyAdmin. 
It adds a settings page to “Dashboard”->”Settings”->”WP Clean Up” where you can clean up the wordpress database. 
It allows you to remove the redundant data within few clicks. 
It is a effective tool to keep your database clean and surely save a lot of space of your MySQL Database.
<h4>Usage</h4>
<ol>
<li>Download and extract <code>wp-clean-up.zip</code> to <code>wp-content/plugins/</code></li>
<li>Activate the plugin through the ‘Plugins’ menu in WordPress.</li>
<li>“Dashboard”->”Settings”->”WP Clean Up”</li>
<li>For more information of this plugin, please visit: <a href="http://boliquan.com/wp-clean-up/" title="WP Clean Up" rel="nofollow ugc">Plugin Homepage</a>.</li>
</ol>
Related Links:
<ul>
<li><a href="http://boliquan.com/wp-clean-up/" rel="nofollow ugc">WP Clean Up (FAQ)</a> | <a href="https://wordpress.org/plugins/wp-clean-up/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/wp-smtp/" rel="nofollow ugc">WP SMTP</a> | <a href="https://wordpress.org/plugins/wp-smtp/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/wp-anti-spam/" rel="nofollow ugc">WP Anti Spam</a> | <a href="https://wordpress.org/plugins/wp-anti-spam/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/wp-code-highlight/" rel="nofollow ugc">WP Code Highlight</a> | <a href="https://wordpress.org/plugins/wp-code-highlight/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/wp-slug-translate/" rel="nofollow ugc">WP Slug Translate</a> | <a href="https://wordpress.org/plugins/wp-slug-translate/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/yg-share/" rel="nofollow ugc">YG Share</a> | <a href="https://wordpress.org/plugins/yg-share/" rel="ugc">Download</a></li>
<li><a href="http://boliquan.com/" rel="nofollow ugc">BoLiQuan</a></li>
<li><a href="http://boliquan.com/" rel="nofollow ugc">玻璃泉</a></li>
<li><a href="http://boliquan.com/" rel="nofollow ugc">夜光</a></li>
<li><a href="http://boliquan.com/ylife/" rel="nofollow ugc">YLife</a> | <a href="http://code.google.com/p/ylife/downloads/list" rel="nofollow ugc">Download</a></li>
</ul>

WP Clean Up

WP Clean Up can help us to clean up the wordpress database by removing "revision" "draft" "auto draft" and so on.

Upload Directory Cleaner vs WP Clean Up