Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
Whale - Video Q&A with influencers and experts 🐳
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
Fishoal - Fishoal is the next-generation Q&A platform that helps anyone who needs help to find validated answers by connecting people to certified experts that can help.
Notifu - Notifu, a free open source pop-up balloon utility
Questionwave - The easiest way to take questions from your audience.