Download of GMReader 1.3.4 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free software for Mac is shrek.
The application lies within Productivity Tools, more precisely Office Tools. 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.
From the developer:
GMaster Reader is a fully functional book reader with a simple and beautiful interface that provides a good reading experience. The application supports reading EPUB, CHM, and Kindle files, which you can export to EPUB and PDF. In addition, the tool supports page turning, zooming, and sidebar shrinking.
You may want to check out more Mac applications, such as pdf-DocPro, Instant PDF or Simply Notes, which might be similar to GMReader.