The 1.9.3 version of Unicorn HTTPS for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Security Tools, more precisely Personal Security.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of this free Mac application is Unicorn Soft, Inc.
From the developer:
Unicorn HTTPS can change DNS quickly and easily. The app is created to give freedom of Internet access and personal information protection. Unicorn HTTPS secures all users' private information. It does not trace or save any private information from the used apps or visited websites. The tool can be used freely by clicking the button once on your current browser.
You may want to check out more software for Mac, such as GSA HTTP Sniffer, Mystery of Unicorn Castle: The Beastmaster or Mystery of Unicorn Castle, which might be similar to Unicorn HTTPS.