Alexa
Alexa provides analytical insights to benchmark, compare and optimize businesses on the web.
http://www.alexa.comSimilarWeb
Compare website traffic with SimilarWeb.com's advanced traffic estimator tool. See any website's traffic sources & uncover their online marketing strategies.
http://www.similarweb.comClicky
Clicky Web Analytics is simply the best way to monitor, analyze, and react to your blog or web site's traffic in real time.
http://www.clicky.comCrazy Egg
Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversi...
http://www.crazyegg.comOptimizely
Enterprise-level A/B testing and personalization for the web and mobile apps.
http://www.optimizely.comKISS Metrics
http://www.kissmetrics.com
Compete
Compete PRO lets you run and export unlimited, more comprehensive domain reports. Get started today for exclusive early data access each month and much more.
http://www.compete.comMint
The original Mint. Mint is the only self-hosted, real-time, extensible web stats app. Satisfy your sweet tooth for site stats and get Minted!
http://www.haveamint.comGoogle Analytics
http://analytics.google.com