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Apache JMeter - Apache JMeter™.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Selenium - Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
locust - An open source load testing tool written in Python.
Better Uptime - We call you when your website goes down