Download of RealGuitar ToolBox 1.1 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application is categorized as Audio & Video Tools. 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 Mac application is MusicLab Inc.
From the developer:
This plug-in will allow you to use RealGuitar in a new way while performing live. The guitar parts can be played simultaneously with two individual RealGuitars from a single keyboard. The program gives you the ability to to switch between 12 RealGuitars with individual settings.
You may want to check out more software for Mac, such as RealGuitar, Toolbox for iWork or Toolbox for Pages - Templates Bundle, which might be related to RealGuitar ToolBox.