Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Toby - Better Than Bookmarks
Pocket - When you find something you want to view later, put it in Pocket.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Basket - A note taking application for KDE. Lots of features.
Freezetab - A powerful alternative to bookmarks.