Dioretsa 3.6.3 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. The most popular versions of Dioretsa for Mac are 3.6 and 3.5.
We recommend checking the downloaded files with any free antivirus. The actual developer of this Mac application is UM App Share. This application's bundle is identified as com.ump.Dioretsa. The program lies within System Tools, more precisely File Managers. This application works fine with Mac OS X 10.6 or later.
From the developer:
Dioretsa is a PDF viewer that manages PDF files with tabs. The name of PDF file would be shown in the tab and window title. It can select tab by tab-list, search a word from search box and show outline of PDF file smoothly by using Dioretsa. In addition, view in full screen, show current PDF file in Finder and move among tabs are available.
You may want to check out more software for Mac, such as pdf-FieldMerge or getTunes, which might be similar to Dioretsa.