Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Syften - Better social media keyword alerts
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
mention - Media monitoring made easy with Mention. Create alerts on your name, brand, competitors and be informed in real-time of any mention on the web and social networks
Freezetab - A powerful alternative to bookmarks.
Google Alerts - Google Alerts will send you email or RSS updates of the latest relevant Google results (web, news...