Our website provides a free download of SketchEl 1.6 for Mac. The application is included in Education Tools. This free Mac application is a product of Dr Alex M Clark.
From the developer:
SketchEl is an interactive chemical molecule sketching tool and molecular spreadsheet data entry application. The feature set provided by the molecular sketcher is largely limited to the minimum features required to conveniently edit diagram representations of small molecule structures. Toolbars, templates, mouse gestures, keyboard shortcuts, utility commands and several view modes are offered in order to make this as convenient as possible.
You may want to check out more software for Mac, such as Genealogy Pro, sciatrope or Curvus Pro X, which might be related to SketchEl.