Download of Screen on Screen 1.0.3 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. This free Mac application was originally designed by Guoye Zhang. 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:
Screen on Screen is a handy application that allows you to view your external display in a window. With this program, you can easily operate your applications, since mirroring is eliminated. The tool allows you to add pitch to zoom and fixes the empty screen menu.
You may want to check out more Mac applications, such as Screen Record Studio Lite, Screen-Recorder or Voila: Powerful screen capture & screen recorder for Mac, which might be related to Screen on Screen.
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