The 1.5 version of XcreenKey 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. This software for Mac OS X was originally created by Cross-Discipline Technology. 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.
From the developer:
XcreenKey is a software keyboard for Mac OS X Leopard or Tiger at extremely low cost.
In particular, this "Aluminum" look software keyboard is a must have collection for your Aluminum MacBook Pro/PowerBook, Mac Mini, Mac Pro/PowerMac G5 or Aluminum Cinema Display.