Download of DropboxExport 2.10.4 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. This Mac application is a product of Alloyphoto. We recommend checking the downloaded files with any free antivirus. DropboxExport for Mac belongs to Design & Photo Tools.
From the developer:
The Dropbox Plug-in allows you to export photos from Adobe Lightroom directly to your Dropbox account. It supports publish operations in Lightroom 3 and above, and export operations. The app imports the existing folder structure from Dropbox into your Lightroom catalog. Also, it provides automatic pairing of online photos with photos in your catalog.
You may want to check out more Mac applications, such as Cuadro or Resize Now, which might be related to DropboxExport.