Hubfly - Intranet solutions integrated with Office 365
Snarl - Snarl is a notification system for Windows.
Quiver - Quiver is a notebook built for programmers.
Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
Bear - Bear.app is a note-taking and content writing app that helps you boost productivity with its intuitive tools.
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.