LinkLocker - LinkLocker is a lightweight bookmarking service with an emphasis on privacy.
Advanced Bookmark Search - A fast offline search engine for bookmarks that supports searching operators
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
Unmark - Hosted bookmark management app
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Pocket - When you find something you want to view later, put it in Pocket.