CoolerController-free 1.0.1 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.
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 software lies within System Tools, more precisely Device Assistants. This free Mac app was originally developed by setMinami Software Lab.
From the developer:
CoolerController-free can control the wind force of the fan by changing the power-on frequency. The app is designed to cool down your Mac by means of an external PC fan. The program monitors the CPU loads in real time, and outputs the appropriate power to the fan. In addition, it helps you save your MacBook's battery life effectively.
You may want to check out more software for Mac, such as toDoo, NWD-211AN Utility or BESAgent, which might be similar to CoolerController-free.