UptimeRobot App - Web, SSL, ports & Cron-jobs monitoring
UXPin + Slack - Keep tabs on design projects in Slack
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Attentive - A marketing channel, built for retail & e‑commerce
Robodash - Cron and uptime monitoring dashboard
Get Notified - Get Notified when something happens