Creddon - Tweet for a cause and a sponsor will donate $1 to charity
RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
TAP London - Tackling the homeless problem together
DontPayFull - Verified coupons and discounts for a variety of online retailers.
UpEffect - Crowdfunding for social good products
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything