Platypus - Realtime server monitoring and reporting
Cloud Functions for Firebase - Serverless / Task Processing
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Monitornator - Server monitoring made simple
Obzrv.it - Obzrv.it is a universal web monitoring service.
OpsDash - All-in-one solution for monitoring servers, services, uptime and databases. Curated Dashboards. Rule-based alerting.