My own cron manager plugin, It shows when your cron actions are linked and allows one to reschedule or trigger now! Very handy to have with any plugin that has a cron job and esepcially when developing and testing these cron jobs. Available free at https://wordpress.org/plugins/amr-cron-manager/

Features

Flag if cron action missing ( a common mistake developers make)
Show arguments or parameters
Show time usefully in the timezone of the blog, not the server, tasks grouped by time slot
Really and Truly Kill a Cron Job (as much as one can, some are immortal!)
Run a job right now (or rather at next cron trigger)
Give you a cron trigger link so you can see any errors that may come to the screen

Latest version

2.3 (2016 06 03)

tweaked layout, added timezone string to heading
now available at https://wordpress.org/plugins/amr-cron-manager/

2.2 (2014 11 04)

added help
fixed a timezone funny
changed date formats to take up less space (note these are localisable via wp’s date_i18n)
added a catchall for deleting individual cron actions with numeric arguments

Screenshots

run the cron immediately

shows arguments for cron jobs if any

Cleanup old jobs or help Debug non running cron jobs with issing actions

Cron Overview

Free at https://wordpress.org/plugins/amr-cron-manager/