Downloading TCPSyphonServer 1.90 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. TCPSyphonServer for Mac belongs to System Tools. This free Mac application is an intellectual property of TECHLIFE SG Pte.Ltd.
From the developer:
TCPSyphonServer is a free-to-use app that allows you to encode image files using TCPSyphon application. By selecting the appropriate encode to network bandwidth you use, even on poor network environment it can carry out delivery without quality loss on image data.
You may want to check out more software for Mac, such as Plug Tools, Panther Cache Cleaner or Startup Chime Stopper, which might be related to TCPSyphonServer.