Platypus - Realtime server monitoring and reporting
Snarl - Snarl is a notification system for Windows.
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Notifo - Notifo is a mobile notifications platform empowering developers to build their own services with a...
Monitornator - Server monitoring made simple
Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.