Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
Pushbullet - Pushbullet - Your devices working better together
Logwatch - Logwatch is a customizable log analysis system.
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Notifu - Notifu, a free open source pop-up balloon utility
Gotify - a simple self-hosted server for sending and receiving messages