The 4.2 version of Raybench for Mac was available to download 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 software for Mac is macflash. The software relates to System Tools.
From the developer:
Raybench is an operating system speed test application. This test, unlike other synthetic tests, shows the performance of your device using a simple image rendering task as an example. The benchmark renders a picture and shows how many rays per second your device processes in a given operating system. It is important to understand that a device running different operating systems can behave differently.
You may want to check out more software for Mac, such as GFXBench or GravityMark, which might be related to Raybench.