Wikipedia
Open Source
Wikipedia is the most popular community-created knowledge base.
Ludwig.guru
Free
Ludwig is a smart translator and linguistic search engine which helps you to find the perfect word or sentence to express your ideas.
WordReference
Freemium
WordReference is an online translation dictionary for, among others, the language pairs English-French, English-Italian, English-Spanish, French-Spanish, Span…
dict.cc
Free
dict.cc is a free, multilingual online dictionary. The site's database can also be downloaded and used offline.
Encyclopædia Britannica
Commercial
Encyclopædia Britannica is a general knowledge English-language encyclopaedia.
Dictionary.com
Free
Dictionary.com is an online dictionary platform.
StarDict
Open Source
StarDict is a free GUI released under the GPL for accessing StarDict dictionary files.
Tatoeba
Open Source
Tatoeba.org is a free collaborative online database of example sentences geared towards foreign language learners.
Merriam-Webster
Free
Merriam-Webster is an online dictionary.
Wordnik
Free
Wordnik is an online English dictionary and language resource that provides dictionary and thesaurus content.
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