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.

Automattic

Claudio Sanches

Ron Rennick

royho

Barry

Peter Fabian

sadowski

Vedanshu - a11n

Julia Amosova

Néstor Soriano Vilchez

obliviousharmony

Action Scheduler is a scalable, traceable job queue for background processing large sets of actions in WordPress. It’s specially designed to be distributed in WordPress plugins.
Action Scheduler works by triggering an action hook to run at some time in the future. Each hook can be scheduled with unique data, to allow callbacks to perform operations on that data. The hook can also be scheduled to run on one or more occasions.
Think of it like an extension to <code>do_action()</code> which adds the ability to delay and repeat a hook.
<h3>Battle-Tested Background Processing</h3>
Every month, Action Scheduler processes millions of payments for <a href="https://woocommerce.com/products/woocommerce-subscriptions/" rel="nofollow ugc">Subscriptions</a>, webhooks for <a href="https://wordpress.org/plugins/woocommerce/" rel="ugc">WooCommerce</a>, as well as emails and other events for a range of other plugins.
It’s been seen on live sites processing queues in excess of 50,000 jobs and doing resource intensive operations, like processing payments and creating orders, at a sustained rate of over 10,000 / hour without negatively impacting normal site operations.
This is all on infrastructure and WordPress sites outside the control of the plugin author.
If your plugin needs background processing, especially of large sets of tasks, Action Scheduler can help.
<h3>Learn More</h3>
To learn more about how Action Scheduler works, and how to use it in your plugin, check out the docs on <a href="https://actionscheduler.org" rel="nofollow ugc">ActionScheduler.org</a>.
There you will find:
<ul>
<li><a href="https://actionscheduler.org/usage/" rel="nofollow ugc">Usage guide</a>: instructions on installing and using Action Scheduler</li>
<li><a href="https://actionscheduler.org/wp-cli/" rel="nofollow ugc">WP CLI guide</a>: instructions on running Action Scheduler at scale via WP CLI</li>
<li><a href="https://actionscheduler.org/api/" rel="nofollow ugc">API Reference</a>: complete reference guide for all API functions</li>
<li><a href="https://actionscheduler.org/admin/" rel="nofollow ugc">Administration Guide</a>: guide to managing scheduled actions via the administration screen</li>
<li><a href="https://actionscheduler.org/perf/" rel="nofollow ugc">Guide to Background Processing at Scale</a>: instructions for running Action Scheduler at scale via the default WP Cron queue runner</li>
</ul>
<h3>Credits</h3>
Action Scheduler is developed and maintained by <a href="http://automattic.com/" rel="nofollow ugc">Automattic</a> with significant early development completed by <a href="https://flightless.us/" rel="nofollow ugc">Flightless</a>.
Collaboration is cool. We’d love to work with you to improve Action Scheduler. <a href="https://github.com/woocommerce/action-scheduler/pulls" rel="nofollow ugc">Pull Requests</a> welcome.

Action Scheduler

Great to have this functonality in a plugin

Looks like good and useful

How Action Scheduler only has two reviews is beyond me, though I guess I more typically use it as a library within whatever I'm developing rather than as an actual plugin. 

Regardless, Action Scheduler is awesome and an absolutely vital contribution to the WordPress community. It's really the only good way to reliably get intensive, bulk recurring actions happening with useful reporting on if scheduled events are happening and such. WAY better than trying to leverage WP's native "wp-cron" task scheduling system.

Documentation is good too. What more could you ask?

Should be in core


Developers refuse to support their own plugin.  I have no use for something that does not work, and something the developers will not support.



Cannot and will not recommend to anyone... sadly will not make much of a difference because it's in use in every site that utilizes WooCommerce, but, whatever...


Refuses to Support


A must-use if you want to schedule any type of task, no more wp_schedule headaches.


Great time savior plugin

Action Scheduler - Job Queue for WordPress

Delete Spam Daily vs Action Scheduler