Modlishka

Mitmproxy intercepts, inspects, and modifies HTTP/HTTPS traffic between your applications and the internet in real time. It's a tool that demonstrates why SMS and TOTP-based 2FA aren't as secure as people think.

Fully free. No paid tier. This is a security research tool, not a commercial product. Set it up, point it at a target domain, and it automatically mirrors the real site while capturing everything the user types, including one-time 2FA codes.

The catch: this is a double-edged sword. It's designed for authorized penetration testing only. Using it against targets without permission is illegal. The project hasn't been actively maintained, and modern phishing-resistant methods like WebAuthn/passkeys defeat it entirely. If you're a defender, this tool shows you exactly why you should be pushing your org toward hardware security keys instead of SMS codes.