Web Application Firewall

• ModSecurity – ModSecurity is a toolkit for real-time web application monitoring, logging, and access control.
• NAXSI – NAXSI is an open-source, high performance, low rules maintenance WAF for NGINX, NAXSI means Nginx Anti Xss & Sql Injection.
• sql_firewall SQL Firewall Extension for PostgreSQL
• ironbee – IronBee is an open source project to build a universal web application security sensor. IronBee as a framework for developing a system for securing web applications – a framework for building a web application firewall (WAF).
• Curiefense – Curiefense adds a broad set of automated web security tools, including a WAF to Envoy Proxy.