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.

Really Good UX - A library of screenshots for UX inspiration

AFSAnalytics - AFSAnalytics.

UX Check - Easy heuristic evaluations on your website (chrome ext.)

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.

Heurix.io - Heurix is a free heuristic evaluation tool that helps you work out how to improve your website.