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.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Linker - Cloud based bookmark manager
Pocket - When you find something you want to view later, put it in Pocket.