The 1.0 version of Cat_Invisible 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. This free Mac application is an intellectual property of a&M STUDIO. The software relates to System Tools.
From the developer:
Cat_Invisible shows and hides invisble files and folders. It stays open until you click the "Quit" button or you hit the Escape key.
You may want to check out more software for Mac, such as WheresTheFreeSpace, which might be similar to Cat_Invisible.