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.
Logwatch - Logwatch is a customizable log analysis system.
Monitornator - Server monitoring made simple
TAI .NET - .NET Framework 4.5 is a highly compatible, in-place update to .NET Framework 4.
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.