nariyanto

Nariyanto Cron Diagnostics is a read-only admin utility for support and debugging workflows. It helps you inspect scheduled WP-Cron events, identify duplicate hooks, flag unusually frequent events, and spot overdue jobs.
Initial scope:
<ul>
<li>Scheduled event list.</li>
<li>Duplicate hook detection.</li>
<li>Unusually frequent recurring event detection.</li>
<li>Overdue event count.</li>
<li>Copy support report button.</li>
<li>Read-only default behavior.</li>
</ul>
No destructive cleanup actions are included in v0.1.2.

Nariyanto Cron Diagnostics

Find duplicate, stuck, and suspicious WordPress cron events before they cause support issues.

anmari

Overview of all cron jobs, showing whether the corresponding action is present. This is handy if you are struggling to write a plugin with a cron job. If there is no action created by the cron job plugin, nothing will happen – just delete the job. 
Includes ability to delete comprehensively and reschedule the jobs. 
Shows time in wordpress timezone, not utc time, so it is much easier to understand!

amr cron manager

An excellent plugin if you want to have a quick look at the WordPress cron queue. Easy reschedule, delete and even a mass delete of all active crons.

Excellent plugin

Overview of wp cron jobs in the site's timezone. The lists show if the action exists and any arguments to the cron job.

Nariyanto Cron Diagnostics vs amr cron manager