Fathom Analytics - Simple, trustworthy website analytics (finally)
Apache JMeter - Apache JMeter™.
Simple Analytics - The privacy-first Google Analytics alternative located in Europe.
Blackfire.io - Blackfire empowers all PHP developers and IT/Ops to continuously verify and improve their app’s performance, throughout its lifecycle, by getting the right information at the right moment.
Plausible.io - Plausible Analytics is a simple, open-source, lightweight (< 1 KB) and privacy-friendly web analytics alternative to Google Analytics. Made and hosted in the EU, powered by European-owned cloud infrastructure 🇪🇺
Sitespeed - Sitespeed.io is an open source tool that helps to analyze and optimize website speed and performance.