The NC is a free, open source, platform-independent software to convert units. It converts numbers with a precision of up to 1000 significant figures. It supports more than 5200 units in 93 categories, and it has been localized in 10 languages.
NC2 on macOS (English GUI, main window)
NC2 on Windows (German GUI, time diff dialog)
NC2 on Windows (English; Random Numbers dialog)
NC2 on Windows (English, Date Picker dialog)
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