Babiloo is a free open source software developed to read offline dictionaries. Runs on most platforms:
GNU/Linux
Windows
Mac OS X
Nokia S60 (>1.9)
Openmoko (Neo FreeRunner)
Supports dictionaries in SDictionary, and StarDict formats. HTML displaying for the supported dictionaries Able to download more dictionaries within the application.
I don't think babiloo works with Lion. After downloading and clicking on the icon, nothing happens. Also, the launchpad link is a 404. It would be nice to have a dictionary aggregator other than pesky babylon.