zfone 0.9 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. This Mac application is a product of com.philzimmermann. The program lies within Communication Tools, more precisely Texting & Video calls.
From the developer:
Zfone is a new secure VoIP phone software product which lets you make secure encrypted phone calls over the Internet. Zfone is not itself a VoIP client, but lets you make secure calls with your existing VoIP client, by filtering, encrypting and decrypting all your VoIP media packets as they pass in and out of your computer. You can use a variety of different software VoIP clients to make a VoIP call.
You may want to check out more software for Mac, such as PhoneAmego, PastebotSync or ScreenHaven, which might be related to zfone.