Snarl - Snarl is a notification system for Windows.
FITTEVER - Fitness at your fingertips. Live fitness classes.
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
SocialBoat.live - A real life Fitness game
Notifu - Notifu, a free open source pop-up balloon utility
Classtra - Single platform for virtual, in-person, hybrid activities