Paragon Software Group has rolled out an upgraded, but still free, version of their Sloved app for Mac OS X. The new version takes advantage of the enhance Dictation feature of Mavericks.
The upgrade offers access to 169 newly upgraded Slovoed dictionaries for 35 world languages. Multiple reference tools and languages can be used in the same shell, with easy switching between them. The dictation feature works both online and offline.
Sloved is available for free at https://itunes.apple.com/app/id524941905 . Dictionaries start at US$9.99.