Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
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.
nginx - A high performance free open source web server powering busiest sites on the Internet.
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.
lighttpd - A secure, fast, compliant, and very flexible web-server that has been optimized for high-performance environments
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems