Toby - Better Than Bookmarks
Tabbie - The missing tab manager for Chrome
xTab - Limit the maximum number of tabs you can open at once
Workona - A better way to work in the browser.
Tab Manager Plus for Chrome - The only tab manager you'll ever need
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.