You can download NanoEngineer-1 1.1 for Mac from our application library for free. NanoEngineer-1 for Mac lies within Education Tools, more precisely Science. This free software for Mac OS X is an intellectual property of Nanorex, Inc.
From the developer:
NanoEngineer-1 is an open-source (GPL) 3D multi-scale modeling and simulation program for nano-composites with special support for structural DNA nanotechnology.
You may want to check out more Mac applications, such as Integrated Data Viewer Installer, HYPHY or UN-SCAN-IT Demo, which might be related to NanoEngineer-1.