Site monitoring - Free open-source website monitoring software, easy to set up and use for monitoring web sites.

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.

Statsignal - Statsignal is a simple and cost-effective way to monitor your website or server and publish a status page of your system.

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.

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.

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