Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Bookmark It - Create awesome notes on YouTube videos
Lynkmark - One place for all your bookmarks
Siimpl Bookmarking - Start collecting and organizing what interests you
Walling - Walling is your visual space to capture ideas and organize projects.