ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.
Notifu - Notifu, a free open source pop-up balloon utility