Download of Geometrix 1.1.2 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this Mac application is Hervé Noury. The program lies within Design & Photo Tools, more precisely Viewers & Editors. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Geometrix is an app that brings you the joy of geometrical drawing on Macintosh using compasses and a ruler.
With this application you can draw straight lines or circles using a pencil or a paint brush. When the drawing is finished, you can erase the paper pencil drafts leaving only the brush strokes.
A big number of examples of geometrical figures is given for imitation.
You may want to check out more Mac applications, such as Smith Chart for Mac, TVPaint Animation or HDR MAX, which might be related to Geometrix.