StructureSynth 1.5.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. The following version: 1.5 is the most frequently downloaded one by the program users. This free software for Mac OS X was originally produced by Structure Synth. The most frequent installer filename for the program is: structuresynth-mac_binary_.zip. The program lies within Design & Photo Tools, more precisely 3D Modeling.
From the developer:
StructureSynth is a cross-platform application for generating 3D structures by specifying a design grammar. Even simple systems may generate surprising and complex structures. The program provides graphical environment with multiple tabs and OpenGL preview.
You may want to check out more software for Mac, such as ImageVis3D, Trapcode Echospace or ImageModeler, which might be related to StructureSynth.