Droppy 1.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within System Tools, more precisely File Managers. This free Mac app was originally produced by D'Urso & Fidotta. 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:
Droppy is a utility that will help you to drag and drop files or folders between spaces or fullscreen apps. Simply click on the app's icon in the status bar and Droppy will be ready to take your file, than you just drag the file to it.
You will have the ability to navigate through spaces, having the mouse free. This is very useful and comfortable.
You may want to check out more software for Mac, such as Liya, which might be similar to Droppy.