WebLOAD - WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details
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.
StresStimulus - Load testing tool for websites and mobile that works with hard-to-test applications.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
OctoPerf - OctoPerf is a SaaS load testing solution, based on JMeter.
Better Uptime - We call you when your website goes down