The Huygens Suite is a package that includes most of the programs part of the Huygens Software. These have some useful FreeWare functionalities, and you can test the full programs for free.
The Huygens Suite is available for the following platforms.
The Current Version of the Huygens Suite can be downloaded from the SVI webpage. There you can also download the Free Sfp volume renderer.
The Huygens Software is named after Christiaan Huygens.