Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
NinjaOne - NinjaOne (Formerly NinjaRMM) provides remote monitoring and management software that combines powerful functionality with a fast, modern UI. Easily remediate IT issues, automate common tasks, and support end-users with powerful IT management tools.
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
Microsoft Operations Management Suite - Microsoft Operations Management Suite enables user to gain visibility and control across the hybrid cloud with simplified operations management and security
Notifu - Notifu, a free open source pop-up balloon utility
Atera - The only IT management platform powered by Action AI™