Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Snarl - Snarl is a notification system for Windows.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Notifu - Notifu, a free open source pop-up balloon utility
Freezetab - A powerful alternative to bookmarks.
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.