The 3.003.3 version of FX Chem 3 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 lies within Education Tools, more precisely Science. This Mac app was originally produced by Efofex Software. 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:
FX Chem makes typing chemical equations almost as easy as typing your name. With FX Chem, you just type the information and FX Chem does the formatting for you. FX Chem understands enough about chemistry to recognise the various components of a chemical equation and puts them in the right place for you. FX Chem will capitalise the elements and put everything in the correct location - all automatically.
You may want to check out more Mac applications, such as FX ChemStruct 2, Course For Cubase 6 106 - FX, EQ, Automation and Mixing or Repair FX, which might be similar to FX Chem 3.