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.

Kuba Mikita

BracketSpace

With Advanced Cron Manager you can manage WP Cron events:
<ul>
<li>view all registered events and their arguments nicely formatted</li>
<li>search events</li>
<li>execute manually any event</li>
<li>add new events</li>
<li>pause events</li>
<li>delete (unschedule) events</li>
<li>ready-to-copy-paste PHP implementation for each event</li>
<li>bulk actions on events</li>
<li>block WP Cron spawning and get instructions how to set Server Scheduler</li>
</ul>
and schedules:
<ul>
<li>view all registered schedules</li>
<li>add new schedules</li>
<li>edit schedules</li>
<li>remove schedules</li>
</ul>
Plugin use AJAX request so you’ll need enabled Javascript in order to use it.
<h4>Advanced Cron Manager PRO</h4>
PRO version includes
<ul>
<li>Better event planning – You can add a custom schedule that will fire your events at a specific time, ie. at noon on the last day of the month, or only Fridays</li>
<li>Cron Logger – log cron’s execution times easily</li>
<li>Events rescheduling – change event next execution date to control server load</li>
<li>Event listeners – you can see what functions or methods are listening for a particular event</li>
<li>Error catcher – catch cron task’s fatal errors and get them displayed in the log</li>
<li>Performance stats – see how much time and memory particular event took</li>
<li>Debug tool – log any useful information from Cron callback</li>
</ul>
<a href="https://bracketspace.com/downloads/advanced-cron-manager-pro/?utm_source=wporg&utm_medium=readme&utm_campaign=readme" title="Advanced Cron Manager PRO" rel="nofollow ugc">Buy now</a>
<h4>Information about WP Cron</h4>
Please remember – after deactivation of this plugin added Schedules will be not available. Added Events will still work.
Important – WordPress Cron is depended on the User. WP Cron fires only on the page visit so it can be inaccurate.
<h4>Custom Development</h4>
BracketSpace – the company behind this plugin provides <a href="https://bracketspace.com/custom-development/" rel="nofollow ugc">custom WordPress plugin development services</a>. We can create any custom plugin for you.

Advanced Cron Manager – debug & control

Thank you for this plugin. I'm liking it better than what I used to use. Excellent interface.

Delete Spam Daily vs Advanced Cron Manager – debug & control