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Yes, OWASP ZAP is completely free and open source. It's an official OWASP project, maintained by a global community of security professionals.
OWASP ZAP (Zed Attack Proxy) is a web application security scanner. It helps find vulnerabilities in your web apps during development and testing. It's the world's most widely used web app scanner.
ZAP is free and open source, making it accessible to everyone. Burp Suite has a paid professional edition with more advanced features. ZAP is excellent for getting started with security testing.
Source: zaproxy.org