There was a download of Viziflow 2.3 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program's installer file is commonly found as ViziFlow.exe.
You can execute this free PC program on Windows XP/Vista/7/10/11 32-bit. We recommend checking the downloaded files with any free antivirus. The program lies within Photo & Graphics Tools, more precisely 3D Design. The most popular version of the Viziflow 2.3. This free software is a product of John Beeteson.
From the developer:
A program to allow the very fast modeling of fluid flow, and the visualization of the streamlines and pressure distribution. Rectangular and circular sections can be entered as well as aerofoils. Example files are included, and many editing tools are provided. A website gives a message board to exchange views.
You may want to check out more software, such as Win4D Advance or FRED Optical Engineering Software, which might be related to Viziflow.