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.
Auto Tab Discard - Auto Tab Discard a lightweight extension that uses the native method (tabs.
Toby - Better Than Bookmarks
FooTab - This Chrome/Iron extension is inspired by the excellent Firefox extension - BarTab, although...
Session Buddy - Manage Your Browser Sessions
Workona - A better way to work in the browser.