Zhen 2.9.6 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. We recommend checking the downloaded files with any free antivirus. This free software for Mac OS X is an intellectual property of Dmitry Schavlik. The software is included in Education Tools.
From the developer:
Zhen is designed to help you read, translate and learn English and Chinese. It offers you the chance to increase your vocabulary and improve your grammar skills. You can learn the language from materials that are of interest to you. The tool allows you to import books in EPUB, PDF, and other formats to the "Library". You can save pages from the Internet using a special extension so you can read and translate instantly offline.
You may want to check out more software for Mac, such as GRE Math, Financial Terms or Legal Terms Dictionary Reference, which might be related to Zhen.