Pocket - When you find something you want to view later, put it in Pocket.
Notifu - Notifu, a free open source pop-up balloon utility
Actually Read It Later - Save articles for reading later
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
Mailist - Receive weekly reminders of unread, bookmarked articles
Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.