TooManyTabs - Ever tried having 20 tabs or more open in Chrome?
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Dustman - Firefox extension to close unused tabs.
Bookmark2 - Bookmarks2 is a powerful productivity tool that makes is much easier for anyone to save their links...
Pocket - When you find something you want to view later, put it in Pocket.
Linkman - Linkman Pro allows for managing large amount of URLs in its own database.