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.
LinkLocker - LinkLocker is a lightweight bookmarking service with an emphasis on privacy.
Linker - Cloud based bookmark manager
Bookmarks Clean Up - Find and remove duplicated bookmarks manually and in batches, get rid of broken bookmark links and empty folders.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.