ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. It has a robust event-based programming language which provides protection from a range of attacks against web applications and allows for HTTP traffic monitoring, logging and real-time analysis.
owasp-modsecurity/ModSecurity is engineered as a server, cloud service, or developer package. It is primarily deployed via Docker containers or package managers rather than a single desktop executable.