Linux has many dictionary programs, but I think there are only 2 program that equivalent to useful Windows's Babylon dictionary, they are LightLang and Stardict
I choose Lightlang because Stardict's rather messed, some features I like such as integrated online-translations don't work, but Google text-translator in Lightlang work very good.
Dictionary databases can be download from: ftp.etc.edu.ru/pub/soft/for_li… and lightlang.org.ru/ll/forum/view…
Well, if you are using Linux, I hope that's helpful info.