Download of CommCalc 1.0 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.
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. The actual developer of this free Mac application is Lance Schlegel. The application is included in Business Tools.
From the developer:
Allows you to quickly calculate a gross total (base amount your commission) using the mark up percentage you enter. CommCalc displays the gross total and your commission. The data available within the widget is available for copy and paste operations.
You may want to check out more Mac applications, such as Personal Finance or Putler, which might be similar to CommCalc.