Sitebar - SiteBar is an Online Bookmark Manager.
Tidyfavorites - User-friendly app for your favorite bookmarks.
Linkman - Linkman Pro allows for managing large amount of URLs in its own database.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
LinkLocker - LinkLocker is a lightweight bookmarking service with an emphasis on privacy.
Quicklinkr - Organize & Share your favorite links. Discover & Save new ones.