OWASP ZAP 2.5 is available as a free download on our software library. OWASP ZAP lies within Development Tools, more precisely Debugging Tools. The actual developer of the free software is OWASP. The file size of the latest installer available for download is 71.8 MB.
From the developer:
The OWASP Zed Attack Proxy (ZAP) is a collection of security tools. It can help you automatically find security vulnerabilities in your web applications while you are developing and testing them. Its also a helpful for experienced pentesters to use for manual security testing.
You may want to check out more software, such as OWASP Zed Attack Proxy, ZAP-fiX or Zaps Installer for MySpaceIM, which might be similar to OWASP ZAP.