Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Toby - Better Than Bookmarks
Deprocrastination.co - Turn your browser into a calm, lean productivity machine
Workona - A better way to work in the browser.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Tabbie - The missing tab manager for Chrome