Cronitor - Monitor cron jobs, micro-services, daemons and almost anything else, no setup required. Easier cron troubleshooting and no more silent failures.
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
EasyCron - Get frustrated with Cron on your server? Hosting limits your Cron use?
UptimeRobot App - Web, SSL, ports & Cron-jobs monitoring
Cronly - Keep track of your cron jobs and SSL certificates. Don't let them fail unnoticed.
WebGazer - Monitor your website's availability with WebGazer, review its performance and get instant notifications when your website goes down. No installation required and free plan available.