CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
Naxsi - NAXSI means Nginx Anti XSS & SQL Injection.
Myra Security - The Myra Security-as-a-Service platform monitors, analyzes, and filters malicious internet traffic before virtual attacks can do any real harm.
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
Altospam - Antispam and antivirus software on Cloud
DDoS-GUARD - DDoS protection for websites and networks. CDN included.