• Oxford (Advanced Learners): English dictionary & American English
• Chambers: English dictionary
• Collins: English dictionary
• Cambridge (advanced learner's dictionary)
• Longman: English dictionary
• Merriam-Webster (American) meaning, etymology, pronunciation (+ audio) & thesaurus
• Visual dictionary by topics
• American heritage: dictionary
• The Century Dictionary (American, 1881) dictionary & encyclopedia: 500 000 meanings
• Etymonline: etymological dictionary
• Word info: etymology of English words derived from Latin and Greek words
• Roget's Thesaurus: synonyms & broaders
• Hyperdic: synonyms & broaders, meanings
• Dictionary.com: American dictionaries: Random House, American Heritage…
• Wordnik: American dictionaries: American Heritage, Century… & etymology, examples
• Encyclopedia.com: articles from American encyclopedias
• Easier English, basic dictionary (2009)
• Dictionary of synonyms & antonyms, Merriam-Webster (1984)
• Encyclopedia of word and phrase origins by Robert Hendrickson (2008)
• Dictionary of English pronunciation, with American variants, by Harold Palmer, James Victor Martin, Francis Blandford (1926)
• Phonetic dictionary of the English language by Hermann Michaelis & Daniel Jones (1913)
• Rhyme Desk: dictionary of rhymes
• Phonetic word search with the International Phonetic Alphabet (Ipa)
• WordDB: dictionary of rhymes
• RhymeZone: dictionary of rhymes
• Rhymer: dictionary of rhymes
→ Encyclopædia Britannica, A Dictionary of Arts, Sciences, Literature and General Information (1911)
→ Old English - Anglo-Norman - Middle English - Early Modern English (16th-18th) - Late Modern English (18th-20th)
• Oxford English Dictionary: The word of the day (x-twitter)
• Merriam Webster: The word of the day
• My first dictionary (humour)
• English words of Indian origin (Amerindian)
• English idioms, sayings and slang, by Wayne Magnuson (2009) + online text
• Reverso: spell checker, correction of spelling and grammar errors
• SpellCheckPlus: spell checker, correction of spelling and grammar errors
• Reverso: verb conjugation
• UsingEnglish: irregular verbs, verb conjugation
• EnglishTenses to learn English tenses
• Education first: English grammar
• Internet grammar of English
• Common errors by Paul Brians
• British Council: English course, grammar, textss (+ audio)
• English grammar, a university course, by Angela Downing & Philip Locke (2006)
• An introduction to English phonology by April McMahon (2002)
• An introduction to English syntax by Jim Miller (2002)
• Dictionary of English usage, Merriam-Webster (1989)
• The elements of style by William Strunk (1918)
• The King's English by Henry Fowler (1908)
• books & papers about the English language: Google books | Internet archive | Academia | Wikipedia
• British Library (United Kingdom)
• Library of Congress (United States)
• Project Gutenberg: books in English & other languages
• Intratext: books as lexical hypertexts
• Wikisource: online texts, by authors
• University of Pennsylvania: online books
• Cornell University Library: historical monographs collection
• Library of Liberty: scholarly works about individual liberty
• Project Gutenberg of Australia
• LyrikLine: poems in English, with translation (+ audio)
• Life magazine (1936-1972)
→ Bible: English translations
→ Old English - Anglo-Norman - Middle English - 16th-18th - 18th-20th
→ American - Canadian - Australian - New Zealand English
→ Irish English - Scots
→ Slang
→ United Kingdom: England - Scotland - Wales - Northern Ireland
→ Ireland
→ United-States - Canada - Canada - Australia - New Zealand