StarDict is a Cross-Platform and international dictionary Software. It has powerful features such as "Glob-style pattern matching", "Scan selection word," "Fuzzy query," etc. Stardict Version3.0 has developed a lot of new functions, such as Full-text translation, Net Dict.
Free dictionaries to download
Full-text translation by Google or Yahoo
Capture text by mouse
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The project seems to be no longer updated. Last version, 3.0.6, released in January 2015, but it can be still downloaded from SourceForge.