Session Buddy - Manage Your Browser Sessions
TooManyTabs - Ever tried having 20 tabs or more open in Chrome?
Tab Wrangler - Automatically closes inactive browser tabs
OneTab - Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.
Workona - A better way to work in the browser.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community