Really Good UX - A library of screenshots for UX inspiration
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.
UX Check - Easy heuristic evaluations on your website (chrome ext.)
Histats - Start tracking your visitors in 1 minute!
Heurix.io - Heurix is a free heuristic evaluation tool that helps you work out how to improve your website.
Matomo - Matomo is an open-source web analytics platform