Virusdie - All-in-One cloud-based, simple, powerful and gorgeous website security tools built for everyone.
Enchanted Security - Client-side website security you'll actually use
Indusface AppTrana - AppTrana offers continuous website security with web application scanning, web application firewall, CDN and DDoS protection.
SSL Alerts - Free service to send SSL certificate expiration alerts
WebARX - Website Protection, Managed Website Security & Website Monitoring
CueObserve - Open-source Anomaly detection on SQL data