Bitcalm - Backup service for your servers
Platypus - Realtime server monitoring and reporting
Dead Man's Snitch - Monitor Cron Jobs and Windows Scheduled Tasks with ease.
OpsDash - All-in-one solution for monitoring servers, services, uptime and databases. Curated Dashboards. Rule-based alerting.
Cronhub - Cronhub helps you to easily monitor all your cron jobs in a beautiful dashboard. It alerts you when your cron job doesn't run on time or it fails.
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.