GoldenDict
6.5#23 in online dictionariesFree planFree planAndroidLinuxmacOSWindows
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GoldenDict suits readers who need to search several dictionary formats, web references, or audio sources, including from other applications. Its Windows installer requires users to obtain local dictionaries separately.
It suits readers who want a broad reference library with vocabulary tools, translation lookup, and offline English dictionary access. It may also suit developers seeking API access, though the listing directs them to contact Farlex for instructions.