Gtmetrix is a specialized tool with which you can analyze your website performance.
With this tool you can see if the images on your website can still be optimized without loss of quality.
Open source load testing tool and SaaS for engineering teams
A simple tool to quickly analyze the performance of your website.
Bugsnag is a full stack stability monitoring solution with the best functionality for mobile applications.
Sitereport is a tool from Netrcraft with which you can get a report on which software a site uses.
Google page speed is the standard when it comes to performance measurement
The world's largest uptime monitoring service.
Pingdom is a platform that can be used to measure the performance of websites.
Webpagetest.org offers a free environment with which you can test the performance of a website.
Uptrends is a complete suite of uptime monitoring and performance dashboards.
New Relic is an enterprise solution for performance measuring and software quality management.
OctoPerf is a SAAS load test platform based on Apache Jmeter
Perftool is an Open Source performance platform
Test my site from Google is a quick test of whether your site is performing well on mobile devices.
Troubleshoot websites, networks, and CDN for quick fixes.
Nice measuring environment that tests for free from 3 locations at the same time.
Varvy Pagespeed Optimization is a tool that offers reports in five sections for free.
A quick and easy tool is the Sucuri Load Time Tester.
Run a quick analysis, evaluate the report and start your website optimization process.
One of the newest website performance tools is offered by Yellow Lab.
This free tool from Google analyzes the code of your website and provides advice.