Domain Traffic & Analytics
Alexa | Leading web & domain traffic estimator and provides an analytic as well.
Clicky | One of the best web analytics and easier to use than Google Analytics.
Google Analytics | It’s from Google, no explanation needed.
SimilarWeb | Very fast loading time for showing web traffics.
Check-Domains | Complete domain/website analyzer. Shows traffic, page rank, links, stats, performance, and etc. 5 analysis requests per hour.