Sometimes it can get overwhelming to keep track of which bookmarks are expired are faulty.
Safari Prairiefire software is designed to clean up Safari's bookmarks jungle.
Safari Prairiefire lists all bookmarks, scans for dead and missing links, duplicates and allows the user to test, delete or edit any bookmarks.
An application for managing your bookmarks on your Mac.
Remove duplicates from iTunes library.
Bookmark Sorter lets you: Alphabetically sort your Safari bookmarks.
Export your Safari bookmarks to other browsers
Sync and manage browser bookmarks, remove duplicate bookmarks.