Trello Calendar Connector by Cronofy - See and Organize your Trello deadlines inside your calendar
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Dashbird - End-to-end observability & debugging platform for serverless applications.
UptimeRobot App - Web, SSL, ports & Cron-jobs monitoring
IsItDown RightNow - "Is It Down Right Now" monitors the status of your favorite web sites and checks whether they are down or not.
Cronitor - Monitor cron jobs, micro-services, daemons and almost anything else, no setup required. Easier cron troubleshooting and no more silent failures.