brockangelo

This plugin schedules a daily event using wp_cron that deletes all comments marked “spam” in the database, then optimizes the comments table.
Brief reason why I made such a low-tech plugin:
Akismet catches all the spam, but when I was looking at the size of my backups one day, 
I noticed that there were large numbers of comment spam across several sites that were undeleted and they 
made the databases fairly large. So I setup a cron job on my server that deletes the spam.
Since I had never written a plugin, I thought this might be helpful for those who do not have 
a dedicated server, shell access to their site, or the knowledge of (or interest in ) cron to set this up.
Spam is not deleted until you start the schedule after the plugin is activated. I created buttons 
to start and stop the schedule if you need that layer of control. There is also a button for deleting all spam manually.

Delete Spam Daily

Uses wp_cron to delete comments each day that are marked "spam" in the database.

marksabbath

Tiago Hillebrandt

<a href="https://wp-healthcheck.com" rel="nofollow ugc">WP Healthcheck</a> is a plugin to check the health of your WordPress install.
It detects some useful information regarding your site health, like the number of active transients and autoload options, and then displays them conveniently via the WordPress Dashboard.
This plugin can help you improve your site performance by cleaning up the transients and deactivating autoload options.
WP Healthcheck also verifies the software versions in use by your server. We maintain information about software minimum requirements up to date in our systems. This allows the plugin to retrieve this information from our external API and compare versus the ones installed in your server.
SSL certificate expiration dates are also checked and notifications for expired or near expiration SSL certificates are provided conveniently via the WordPress Dashboard.
<h4>WP-CLI Extension</h4>
WP Healthcheck also includes a WP-CLI extension. If you want to see all the CLI commands available in the plugin, go ahead and run <code>wp healthcheck</code> in your site.
<ul>
<li><code>wp healthcheck autoload [--deactivate=<option-name>] [--history]</code></li>
<li><code>wp healthcheck transient [--delete-expired] [--delete-all]</code></li>
<li><code>wp healthcheck server</code></li>
<li><code>wp healthcheck ssl</code></li>
</ul>

WP Healthcheck

WP Healthcheck is a plugin to check the health of your WordPress install.

Delete Spam Daily vs WP Healthcheck