- Free • Open Source
Wiktionary is a multilingual, web-based project to create a free content dictionary, available in 158 languages.
Wiktionary vs Duden German Dictionaries opinions
Has more information than duden.de, for example rhymes and translations. Ad and tracking-free.
- Free • Proprietary
- Chrome OS
- Google Chrome
Google's dictionary extension on Google Chrome. With it, you can double-click any word to view its definition in a small pop-up bubble, or search the complete definition of any word or phrase using the address bar dictionary.
- Free Personal • Proprietary
Your Mac also comes with a versatile Dictionary application. It also includes to other reference libraries such as thesaurus, Apple glossary, and Wikipedia.