New Tab by Flickr - Get a beautiful photo each time you open a new tab
UpEffect - Crowdfunding for social good products
New Tab Startup Quotes - Inspiring startup related quotes in every new Chrome tab.
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Less Boring New Tab - Your browser deserves a better new tab page
eSolidar - Charity shops and online auctions to support great causes