Wikipedia
Open Source
Wikipedia is the most popular community-created knowledge base.
Everipedia
Free
Everipedia is the next generation online encyclopedia.
dict.cc
Free
dict.cc is a free, multilingual online dictionary. The site's database can also be downloaded and used offline.
Dictionary.com
Free
Dictionary.com is an online dictionary platform.
WordReference
Freemium
WordReference is an online translation dictionary for, among others, the language pairs English-French, English-Italian, English-Spanish, French-Spanish, Span…
Merriam-Webster
Free
Merriam-Webster is an online dictionary.
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