mactunnel 105.9.7 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Mactunnel for Mac relates to Internet & Network Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The actual developer of this free Mac application is Michał Trojnara.
From the developer:
mactunnel is an stunnel-like tool for the MacOS X operating system. Mactunnel only provides a small subset of features available in stunnel. It uses Secure Transport rather than OpenSSL. For security, it uses keychain for certificate and private key storage rather than pem-encoded files.
You may want to check out more software for Mac, such as FoxTrot, IPNetShareX or CVS Set-Up, which might be similar to mactunnel.