You could have downloaded CAMEOChemicals 2.4.1 for Mac from our software library for free. The most popular version of the tool is 2.4. The actual developer of this free Mac application is NOAA's Office of Response and Restoration. CAMEOChemicals for Mac lies within Education Tools, more precisely Science. The app's installation file is generally known as cameochemicals241.dmg.
From the developer:
CAMEO Chemicals is a database of hazardous chemicals that emergency responders and planners can use to get response recommendations and predict hazards, such as explosions or chemical fires. You can search through thousands of datasheets, using a name, identification number, or other search criteria to find a particular chemical of interest.
You may want to check out more software for Mac, such as Analytics to Earth, TreeView X or NWB, which might be related to CAMEOChemicals.