CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.

ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.

Google Project Shield - Google's DDoS protection service

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

SSL Alerts - Free service to send SSL certificate expiration alerts

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.