Optimizely
http://www.optimizely.com

Optimizely is a world-class website optimization platform, providing A/B and multivariate testing that is incredibly powerful and easy-to-use. Since its founding in 2010 by two former Google product managers, Dan Siroker and Pete Koomen, Optimizely has seen strong and growing demand.

Optimizely enables users with and without technical expertise to make dynamic changes to their websites, test the variations to live traffic, gather immediate results, and start achieving goals. Over 3,500 enterprises have adopted Optimizely and a staggering 223,600+ experiments have been run on the Optimizely platform. The number of experiments is growing rapidly as more individuals and businesses alike realize the power of data-driven decision-making.