Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Toby - Better Than Bookmarks
UptimeRobot App - Web, SSL, ports & Cron-jobs monitoring
Workona - A better way to work in the browser.
Cronitor - Monitor cron jobs, micro-services, daemons and almost anything else, no setup required. Easier cron troubleshooting and no more silent failures.
Tabbie - The missing tab manager for Chrome