X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
Simple Poll - The easiest way to create polls in Slack
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
Padlet - Visual boards for organizing anything.
Notifu - Notifu, a free open source pop-up balloon utility