Imperva SecureSphere - Get the flexibility, reliability, and performance you need to protect your business. SecureSphere covers you both on-premises or in the cloud.
NetWrix Auditor - Configuration Auditing of IT Infrastructure
Barracuda Web Application Firewall - Barracuda Web Application Firewall offers security and DDoS protection against automated & targeted attacks.
LepideAuditor - LepideAuditor Suite - A change auditing software for Active Directory, GPO and Exchange Server.
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
ManageEngine ADAudit - ManageEngine ADAudit is a real-time windows active directory auditing tool.