Wiktionary is a multilingual, web-based project to create a free content dictionary of all words in all languages. Developed by Wikimedia Foundation
License: Open Source
Wiktionary is a free, user-generated online dictionary that excels in providing comprehensive definitions and etymology, making it ideal for language enthusiasts. In contrast, WordReference offers professional translations and bilingual dictionaries, making it more suitable for learners and travelers needing accurate and contextual language references.