AppTrana provides advanced, unmetered DDoS protection and secures your web apps and APIs from malicious traffic while ensuring application availability with a guaranteed uptime of 99.99%. Not just thwarting illegitimate traffic tries to enter the network, it monitors each traffic and protects from all types of DDoS attacks, including layer 3, 4, & 7 attacks, known and emerging threats. It also includes 24/7 expert support and coordination in mitigation.
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
SSL Alerts - Free service to send SSL certificate expiration alerts
AWS WAF - AWS WAF is a web application firewall that helps protect your web applications from common web exploits.
Secure My Website - A pain-free service to add SSL to your site, for non-geeks
Barracuda Web Application Firewall - Barracuda Web Application Firewall offers security and DDoS protection against automated & targeted attacks.
NakedSSL - Hassle-free SSL clothes for your naked domains.