Downloading RAID Monitor 3.2.3 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The application's installation file is generally known as RAIDMonitor_3.2.2.zip. The actual developer of this software for Mac is Squashed Software. We recommend checking the downloaded files with any free antivirus. The most popular version among the application users is 3.2.
From the developer:
RAID Monitor is an application that monitors the state of your RAID and if it detects a problem with the RAID set - it will email you to let you know that there is an issue you need to resolve. This tool fully supports the (Apple-supplied) MegaRAID card, the new AppleRAID card and it also monitors the system log file for drive errors.
You may want to check out more software for Mac, such as LaCie RAID Monitor, LaCie RAID Manager or UFS Explorer RAID Recovery, which might be similar to RAID Monitor.