Snarl - Snarl is a notification system for Windows.
Platypus - Realtime server monitoring and reporting
Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
OpsDash - All-in-one solution for monitoring servers, services, uptime and databases. Curated Dashboards. Rule-based alerting.
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
Healthy Servers - Making server monitoring easy