Download of Molmol 1.0.7 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Molmol for Mac is categorized as Education Tools. The actual developer of this free software for Mac is MOLMOL Administrator. 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.
From the developer:
MOLMOL is a molecular graphics program for displaying, analyzing, and manipulating the three-dimensional structure of molecules, with special emphasis on biological macromolecules. The program has features that make it particularly useful for the study of protein or DNA structures determined by NMR.
You may want to check out more software for Mac, such as sciatrope, Analytics to Earth or TreeView X, which might be similar to Molmol.