BookMacster - Sync bookmarks between different browsers and cloud platforms such as dropbox and icloud
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Pagemark - Private bookmark organizer with tags, thumbnails, and formatted notes
Linkman - Linkman Pro allows for managing large amount of URLs in its own database.
Pocket - When you find something you want to view later, put it in Pocket.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community