There was a download of Graybox 5.54 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most frequent installer filename for the program is: GrayBox.exe.
The most popular versions among Graybox users are 5.5, 3.6 and 3.5. This free program was originally produced by by Skeletonz. The program lies within Development Tools, more precisely Web Development. We recommend checking the downloaded files with any free antivirus.
From the developer:
GreyBox can be used to display websites, images and other content in a beautiful way. Graybox does not conflict with pop-up blockers, it's super easy to setup and use and you can easily alter the style as it is controlled through CSS. It takes very little code to display image galleries
You may want to check out more software, such as OPC Server Toolkit Demo, Gray Simulator or Trader's Home Task, which might be similar to Graybox.