Sitespeed - Sitespeed.io is an open source tool that helps to analyze and optimize website speed and performance.

Netumo - Ensure healthy website performance, uptime, and free from vulnerabilities. Automatic checks for SSL Certificates, domains and monitor issues with your websites all from one console and get instant notifications on any issues.

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.

AppZero - AppZero is a monitoring and migration tool that allows users to keep track of different applications and servers in both simple and complex IT environments.

Apache JMeter - Apache JMeter™.

RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems