CircuitCalc 1.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is Tim Gleason. The program belongs to Productivity Tools.
From the developer:
CircuitCalc is a simple and easy-to-use circuit calculation application. Anyone who works with electric circuits will find this software program very useful. The utility includes Ohm's Law calc, Inverting Op Amp calc, Resistors Color Code calc, and more.
You may want to check out more Mac applications, such as Electric Circuit Calc, which might be related to CircuitCalc.