Download of DropBook 2.3 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. We recommend checking the downloaded files with any free antivirus. The bundle identifier for this app is de.inovation.dropbook.
Dropbook_for_mac_1.5.2.zip is the default file name to indicate this application's installer. The program is included in Communication Tools. The latest version of the program can be downloaded for Mac OS X 10.6 or later. The actual developer of this Mac application is i-NOVATiON GmbH. The most popular versions of DropBook for Mac are 2.3, 2.1 and 2.0.
From the developer:
DropBook is all about posting things to your Facebook profile. Just drag images, links, or text onto the Facebook icon on your desktop. Watch a video tour.
You can also post a status-update message simply by double-clicking on the "f" logo on your desktop. A form window will pop up allowing you to enter and post your message.
You may want to check out more Mac applications, such as Bluebird, Hibari for Twitter or Blabbelon, which might be related to DropBook.