Juanjo Rubio

This plugin lets you manage and change the frequency of WP-Cron events via the Tools section in your dashboard. No coding needed. Translatable and lightweight.
<h3>License</h3>
This plugin is free software. You can redistribute it and/or modify it under the terms of the GNU General Public License version 2 or later.

Cron Scheduler

A WordPress plugin to easily adjust the frequency of cron jobs with a user-friendly interface.

fastcron

This plugin will set up a free cronjob to run your <code>wp-cron.php</code> file automatically. Completely free, no registration required. 
It relies on the free cronjob service provided by <a href="https://www.fastcron.com/?ref=wp" rel="nofollow ugc">FastCron</a>.
Upon activation, it will send your site URL to FastCron, and they will create and run a cronjob every 5 minutes to visit your <code>wp-cron.php</code> file via this URL: 
 https://site-url/wp-cron.php?doing_wp_cron=1
Features: 
– Completely free, no registration required. 
– Simple and fast, just click activate and done. 
– View last 25 execution results on FastCron.
This free plugin is suitable for your personal blog.
If you manage several WordPress blogs/websites for your clients, please <a href="https://app.fastcron.com/signup?ref=wp" rel="nofollow ugc">register an account at FastCron</a> and set up your cronjobs there.
Upon deactivation, the plugin will request FastCron to remove the cronjob to your <code>wp-cron.php</code> file.
By using this plugin, you agree to their <a href="https://www.fastcron.com/about/terms?ref=wp" rel="nofollow ugc">Terms of service</a> and <a href="https://www.fastcron.com/about/privacy?ref=wp" rel="nofollow ugc">Privacy policy</a>.

FastCron – Run WP Cron for free

This plugin will set up a free cronjob at FastCron to run your wp-cron.php file automatically. Completely free, no registration required.

Cron Scheduler vs FastCron – Run WP Cron for free