Amplitude: Amplitude is a web and mobile analytics platform that helps companies understand user behavior.

Google Analytics: Google Analytics allows you to measure your advertising ROI as well as track your Flash, video, and social networking sites and applications.

Quantcast: Quantcast Measure reveals unique audience insights, helping you differentiate your brand, site, or app.

comScore: comScore helps clients measure what matters to make cross-platform audiences and advertising more valuable

Alexa: Alexa software helps your business get better marketing results.

Chartbeat: Chartbeat tracks what people are reading on a second-by-second, pixel-by-pixel basis on each site, article and page

Mixpanel: Learn how people use your app with advanced mobile & web analytics.