OWASP ZAP (Zed Attack Proxy) is an open-source and easy-to-use penetration testing tool for finding security vulnerabilities in the web applications and APIs. As a cross-platform tool with just a basic Java installation pre-requisite, it provides vulnerability scanning for beginners and penetration testing for professionals. It can be downloaded and installed as a standalone application or Docker image.
Additionally, the OWASP community has exposed ZAP APIs, which allows ZAPs to integrate with other tools/frameworks.