mactunnel is an stunnel-like tool for the MacOS X operating system. mactunnel is authored by Michał Trojnara and licensed under GNU GPL version 2.

The main differences between mactunnel and stunnel are:

• mactunnel only provides a small subset of features available in stunnel.
• mactunnel uses Secure Transport rather than OpenSSL.
• mactunnel uses keychain for certificate and private key storage rather than pem-encoded files.