wycks

Will add a little “x” next to any files/folders set to 777, since this is inherently insecure. Checks all recursive folders that come with a default WordPress install.
This plugin can be CPU intensive as it iterates over your whole folder/file structure to gather statistics.
Notes :
<ul>
<li>Checks root, wp-admin, wp-content, wp-includes and all sub folders</li>
<li>Includes your plugin and theme folders</li>
<li>Ignores images, text, CSS , and translation files</li>
<li>Will exclude the cache folders since they contain to many files to scan.</li>
<li>Requires PHP 5.1.2 or greater</li>
<li>Please run this during low traffic.</li>
</ul>
This plugin will not return accurate results under IIS or WAMP stack due to how windows handles file permissions.

File Permissions & Size Check

Simple plugin that checks your WordPress install and shows your file permissions, size, and last modified date.

WP Zone

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Potent Plugins

The WP Squish plugin helps to reduce the amount of storage space consumed by your WordPress installation through the application of user-definable JPEG compression levels and image resolution limits to uploaded images.
Features:
<ul>
<li>Set a resolution (width and height) limit for the “full size” images; images exceeding the limit are resized when uploaded.</li>
<li>Customize the compression level (on a scale of 1 to 100) for each of the downsized copies of a JPEG image generated by WordPress when it is uploaded.</li>
<li>Optionally recompress the full size versions of all JPEG images when they are uploaded.</li>
</ul>
If you like this plugin, please consider leaving a comment or review.
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WP Squish

Reduce the amount of storage space consumed by your WordPress installation through the application of user-definable JPEG compression levels and image …

File Permissions & Size Check vs WP Squish