DatasetAdded By Infochimps
From the website:
> XDXF is a project to unite all existing open dictionaries and provide both users and developers with universal XML-based format, convertible to and from other popular dictionary formats.
There are currently 308 dictionary files in various languages.
It appears dictionary files are in XML.
The [SourceForge XDXF project page](http://sourceforge.net/projects/xdxf/) says material is available under GPL.
Dictionaries are available on the [download page](http://xdxf.revdanica.com/down/).