Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
LinkLocker - LinkLocker is a lightweight bookmarking service with an emphasis on privacy.
IsYourLinkSad? - Is Your Link Sad. Make It Happy. Share your URLs to people who actually care.
Bookmarks Clean Up - Find and remove duplicated bookmarks manually and in batches, get rid of broken bookmark links and empty folders.
The Bored Hoard - Sieve the web for cool websites you probably never knew existed. Supporting the smaller independent sites that Google ignores. All revealed in a weekly box delivered online every Friday.
URL Manager Pro - URL Manager Pro for Mac OS, the most powerful bookmark manager for the Mac for use with Safari, Firefox and Chrome