Firefox Sync - Bring your Firefox bookmarks, tabs, or passwords wherever you go with Firefox Sync. Share between computers and mobile devices. Get Firefox now!
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Linkman - Linkman Pro allows for managing large amount of URLs in its own database.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
URL Manager Pro - URL Manager Pro for Mac OS, the most powerful bookmark manager for the Mac for use with Safari, Firefox and Chrome