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Making cron jobs fun again: a tool for simple recurring tasks - DEV Community
Configuring Cron Jobs – Easy!Appointments
Easy CRON jobs to backup your Website
EasyCron | Drupal.org
GitHub - Steve-Mcl/node-red-contrib-cron-plus: A flexible scheduler node for Node-RED (featuring full dynamic control, sunrise/sunset by location and Timezone support)
My favorite open source tool for using crontab | Opensource.com