SimilarWeb - SimilarWeb.com is a website analysis tool that gives you analytics information for any website.
StatCounter - StatCounter is a simple but powerful real-time web analytics service that helps you track, analyse and understand your visitors so you can make good decisions to become more successful online.
Site Rank Data - View historical rank information of websites via time series charts.
AFSAnalytics - AFSAnalytics.
Website Informer - Website.informer: complete data lookup & free aggregated report on any domain including whois, visitors, IP & DNS details, competitors, owners, etc
Woopra - Track your customers' web and mobile activity, forms, emails, support tickets and more, all in one place with customer analytics. Analyze and take action.