Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
Zoho Meeting - Free video conferencing, online meeting, desktop sharing solution from Zoho.
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
Airtime - Hang out with group video, share music & videos
Notifu - Notifu, a free open source pop-up balloon utility
Voxox CloudPhone - Get a local or toll-free business number that automatically answers, routes and transfers calls, plus other professional business phone services.