VWO provides A/B, split and multivariate testing software.
http://visualwebsiteoptimizer.com
Analytics and Tracking · A/B Testing
Get access to data on 466,247 websites that are Visual Website Optimizer Customers. We know of 54,475 live websites using Visual Website Optimizer and an additional 411,772 sites that used Visual Website Optimizer historically and 31,294 websites in the United States.
Get a list of 466,247 websites using Visual Website Optimizer which includes location information, hosting data, contact details, 54,475 currently live websites and an additional 266,637 domains that redirect to sites in this list. 411,772 sites that used this technology previously and 31,294 websites in the United States currently using Visual Website Optimizer.