Select word or phrase with Alt key pressed - then hover over an icon below the selection. Almost instantly you will see a tooltip with the translation.
GoldenDict Alternatives
GoldenDict is described as 'Open-source dictionary program for PC computers that gives translations of words and phrases for different languages. It allows use of several popular dictionary file formats simultaneously' and is a very popular Dictionary in the education & reference category. There are more than 50 alternatives to GoldenDict for a variety of platforms, including Android, Web-based, Windows, Linux and iPhone apps. The best GoldenDict alternative is Wiktionary, which is both free and Open Source. Other great apps like GoldenDict are GoldenDict-ng, WordReference, FreeDictionaryApp and Lingoes.
Alternatives list
Snapsrch is a Mac app that allows you to quickly search favorite websites and get results in a floating window without opening multiple browser windows or switching between apps.
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Italy
EU