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.

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 Scheduler vs FFF-Cron-Manager