The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications. It is designed to be used by people with a wide range of security experience and as such is ideal for developers and functional testers who are new to penetration testing. ZAP provides automated scanners as well as a set of tools that allow you to find security vulnerabilities manually. Mac OS X release.
You can download it from the following link: https://packetstormsecurity.com/files/download/134646/ZAP_2.4.3_Mac_OS_X.dmg
Source: https://packetstormsecurity.com/files/134646/Zed-Attack-Proxy-2.4.3-Mac-OS-X-Release.html