The 1.0 version of iGrandDesigner for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application is categorized as Design & Photo Tools. We recommend checking the downloaded files with any free antivirus. This free Mac app was originally produced by KARI HALLFAST.
From the developer:
iGrandDesigner is a spline-based freeform geometric modeler which includes a world class sketcher, full Boolean operations, rounds and offsetting (optionally using true offset surfaces). Functionality ranges from very high level (creating advanced parts from sketch geometry for example) to very low level (like cutting and stitching individual surfaces).
You may want to check out more software for Mac, such as Vectorworks 2010 Viewer, RealCADD or Polaris, which might be related to iGrandDesigner.