Milan Dinić

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This plugin enables using WordPress as a cron system that would hit external URLs (ie. any URL) on a scheduled basis. User can submit URL and interval in which that URL should be opened by WordPress.
This can be used, for example, for other WordPress sites that are on hosts that don’t have native cron system or where it’s complicated to set it up. For that cases, URL should be in format <code>http://example.com/wp-cron.php</code> and there should be constant <code>DISABLE_WP_CRON</code> in <code>wp-config.php</code> file to avoid running WordPress own pseudo cron: 
 define(‘DISABLE_WP_CRON’, true);
It’s recommended to setup a real cron for the site where this plugin is installed, with interval that is the lowest one from settings. Follow WordPress specific advises from above, and check links from <a href="http://blog.milandinic.com/wordpress/plugins/run-external-crons/" rel="nofollow ugc">plugin’s page</a> on how to set up this.
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Run External Crons

Use WordPress internal cron system to hit external URLs on a scheduled basis.

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

Run External Crons vs FFF-Cron-Manager