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.
TooManyTabs - Ever tried having 20 tabs or more open in Chrome?
Session Buddy - Manage Your Browser Sessions
Tab Wrangler - Automatically closes inactive browser tabs
Tabs Outliner - Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works.
SplitUp! - A fun and elegant tab manager