EdwardBock

Palasthotel

Have you ever wondered what you WordPress is doing in wp-cron.php? Now you can see it. This plugin logs every schedule.
<h3>Arbitrary section</h3>

Cron Logger

This plugin works but did not cleanup its table and data in options table in my DB.

Leave junks in my DB

Great for troubleshooting

No3x

Felipe Figueroa

WP Plugin URL: https://wordpress.org/extend/plugins/fff-cron-manager/
This plugin will add an option to list, delete and restore cronjobs in WP Cron. It’s loosely based on Simon Wheatley’s https://wordpress.org/extend/plugins/cron-view/
Compatible up to version 3.5.2
It will create a backup of your crons when you install it, in order to be able to restore anything that may get broken.
Future releases may include the capability of creating new cronjobs.

FFF-Cron-Manager

Great plugin.

This plugin will add an option to list, delete and restore cronjobs in WP Cron

Cron Logger vs FFF-Cron-Manager