Easy User Test - Easy User Test is a user testing tool that offers the easiest way to test your text and design.
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.
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.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring