SystemLoad 4.2 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. The software belongs to System Tools. The actual developer of this free software for Mac is Marcel Bresink Software-Systeme. 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.
From the developer:
SystemLoad is a diagnostic application assisting you in the detection of cooling or power supply problems with Apple Macintosh computers. The tool can put a user-definable load onto one or more processors.
You may want to check out more software for Mac, such as PleaseSleep, Namely or Show Desktop, which might be related to SystemLoad.