Download of PDF Master 2.3 for Mac was on 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 Diigo Inc. The application is categorized as Productivity Tools. 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.
From the developer:
PDF Master is a Multiple tab PDF reader. You can save your PDF and annotations to Diigo account just as you annotate web pages.
You may want to check out more software for Mac, such as pdf-Recover, PDF Creator or SysTools Mac PDF Unlocker, which might be similar to PDF Master.
Document management
Document management