A list of (mostly free) resources for translators and interpreters, including dictionaries, specialised glossaries/termbases and corpora.

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NameTypeLanguage(s)Notes
LingueeMultilingual dictionaryMultilingualA multiple-language dictionary based on translation memories
Le Trésor de la Langue Française InformatiséMonolingual dictionaryFrench
CILFGlossary/Terminological databaseFrenchMultiple domains. Provided by Conseil International de la langue française
CRISCOSynonyms dictionary/ThesaurusFrench
LexilogosDictionary - miscellaneousFrenchIncludes etymologies, citations, slang words and encyclopaedic entries
Synonymes.comSynonyms dictionary/ThesaurusFrench
Le DictionnaireMonolingual dictionaryFrenchIncludes citations and word synonyms and antonyms
Les-expressions.comDictionary of idioms and phrasesFrench
L'Internaute: expressionsDictionary of idioms and phrasesFrench
L'Internaute: dictionnaireMonolingual dictionaryFrench
Le ConjugueurMiscellaneousFrenchVerb conjugations in French
Oxford Advanced Learner’s DictionaryMonolingual dictionaryEnglish
BNC BYUCorpusEnglishBritish National Corpus (BYU interface)
The Free DictionaryMonolingual dictionaryEnglish
Cambridge DictionariesDictionary - miscellaneousEnglishMonolingual dictionary, dictionary of idioms, learners' dictionary, economic dictionary
Urban dictionaryDictionary - miscellaneousEnglishDictionary of slang and neologisms
Merriam-Webster's dictionaryMonolingual dictionaryEnglish
Thesaurus.comSynonyms dictionary/ThesaurusEnglish
Longman Dictionary of Contemporary EnglishMonolingual dictionaryEnglish
COCA BYUCorpusEnglishCorpus of Contemporary American English (BYU interface)
Macmillan DictionaryMonolingual dictionaryEnglish
WikipediaEncyclopaediaEnglish
WaC corporaCorpusMultilingualLarge, web-crawled corpora of Italian, English, French, German and other languages
BNCCorpusEnglishBritish English Corpus (with limited search interface)
Dictionary.comMonolingual dictionaryEnglishIncludes word synonyms and antonyms
Pro Writing AidDictionary of idioms and phrasesEnglish
Your DictionaryMonolingual dictionaryEnglishIncludes usage examples and word synonyms and antonyms
HowjsayMiscellaneousEnglishEnglish pronunciation dictionary
NetlingoDictionary - miscellaneousEnglishSpecialized dictionary. Domains: Internet language, acronyms and symbols
AcronymfinderDictionary - miscellaneousEnglishDictionary of acronyms and abbreviations
Collins English DictionaryMonolingual dictionaryEnglish
OEDMonolingual dictionaryEnglishOxford English Dictionary
LexisNexisMiscellaneousEnglishA collection of newspaper/magazine article from several countries
UsingEnglish.comMiscellaneousEnglishResources for learners of English. Includes a section on idioms
MDBGBilingual dictionaryEnglish-Chinese
JISHOBilingual dictionaryEnglish-Japanese
Saiga Kanji DictionaryBilingual dictionaryEnglish-JapaneseSupports searches using Japanese characters
Vocabolario TreccaniMonolingual dictionaryItalian
Enciclopedia TreccaniEncyclopaediaItalian
Homolaicus Sinonimi MasterSynonyms dictionary/ThesaurusItalian
Dizionario dei Sinonimi e dei Contrari RCSSynonyms dictionary/ThesaurusItalian
Accademia della CruscaMiscellaneousItalianWebsite of the national institute for the study and protection of the Italian language
Virgilio Sinonimi e ContrariSynonyms dictionary/ThesaurusItalian
Dizionario Sabatini ColettiMonolingual dictionaryItalian
CORIS/CODISCorpusItalian
PaisàCorpusItalianItalian web-crawled corpus
Dizionario delle citazioniDictionary - miscellaneousItalianDictionary of citations (from Italian literature)
Etimo.itDictionary - miscellaneousItalianEtymological dictionary
Dizionari Sapere.itDictionary - miscellaneousItalianIncludes a monolingual dictionary, a dictionary of neologisms and word synonyms and antonyms
Dizionari on-line SimoneDictionary - miscellaneousItalianSpecilized dictionary. Domains: justice, economy, finance and accounting, canon law, European Union, philosophy of politics, psychology, Roman law history, Italian and European law history
Come dire?Synonyms dictionary/ThesaurusItalian
Neologismi (Accademia della Crusca)Dictionary - miscellaneousItalianDictionary of neologisms by Accademia della Crusca
Glossari.itGlossary/Terminological databaseItalianDomains: acronyms and abbreviations, cultural heritage, photography, food and wines, jewellery, hobbies, health and well-being, natural sciences, sports, history, transportation
Coniugazione.itMiscellaneousItalianVerb conjugations in Italian
Larousse Italian-FrenchBilingual dictionaryItalian-French
Laura Tam Italian-SpanishBilingual dictionaryItalian-Spanish
Zanichelli Italian-SpanishBilingual dictionaryItalian-Spanish
Sansoni Italian-GermanBilingual dictionaryItalian-German
LingoStudy.de dictionaryBilingual dictionaryItalian-German
Italian-German dictionaryBilingual dictionaryItalian-German
WordreferenceMonolingual/bilingual dictionaryMultilingual
IATEGlossary/Terminological databaseMultilingualInteractive Terminology for Europe. The EU's terminological database
Google.itSearch engineMultilingualRelated sites: Google.com (English), Google.es (Spanish), Google.de (German)
ReversoMonolingual/bilingual dictionaryMultilingual
ProzMiscellaneousMultilingualTranslators' forum and collection of domain-specific glossaries
Hoepli on-line dictionariesDictionary - miscellaneousMultilingualMain language: Italian. A collection of monolingual and bilingual dictionaries
LeoBilingual dictionaryMultilingualMain language: German
Pons.deBilingual dictionaryMultilingualMain language: German
EUR-LexMiscellaneousMultilingualAccess to European Union law
Dizionari del CorriereDictionary - miscellaneousMultilingualMain language: Italian
LarousseDictionary - miscellaneousMultilingualMain language: French
Bab.laMonolingual/bilingual dictionaryMultilingual
Garzanti linguisticaMonolingual/bilingual dictionaryMultilingualMain language: Italian. Bilingual dictionaries IT<>EN and IT<>FR
Oxford DictionariesDictionary - miscellaneousMultilingualMain language: English Monolingual and bilingual dictionaries
Abbyy LingvoBilingual dictionaryMultilingualMain language: Russian
LexicoolBilingual dictionaryMultilingual
Google imagesSearch engineMultilingualSearch engine for images
DiciosBilingual dictionaryMultilingualMain languages: Italian, English and Spanish
MultitranBilingual dictionaryMultilingualMain language: Russian
Wordreference forumMiscellaneousMultilingualDiscussion forum focusing on language/translation issues
Leeds Internet CorporaCorpusMultilingual
Diccionarios El MundoDictionary - miscellaneousMultilingualMain language: Spanish. Includes
SensagentDictionary - miscellaneousMultilingualAggregates results from various on-line dictionaries
WoxikonDictionary - miscellaneousMultilingualIncludes word synonyms, rhyming dictionary, verb conjugations
GlosbeMonolingual/bilingual dictionaryMultilingual
Dict.ccBilingual dictionaryMultilingualMain language: German
InfopediaBilingual dictionaryMultilingualMain language: Chinese
WiktionaryMonolingual dictionaryMultilingual
AGROVOCGlossary/Terminological databaseMultilingualMultilingual agricultural thesaurus. Provided by FAO
EU glossariesGlossary/Terminological databaseMultilingualDomains: agriculture, environment, law, econonomics, industry, medicine, transportation
ISI glossaryGlossary/Terminological databaseMultilingualDomain: statistics
WTO TermsGlossary/Terminological databaseMultilingualLanguages: English, French and Spanish. Domains: finance and commerce
ITU TermsGlossary/Terminological databaseMultilingualProvided by International Telecommunication Union. Languages: English, French, Spanish, Arabic, Chinese and Russian. Domain: telecommunications
Term-minatorGlossary/Terminological databaseMultilingualLanguages: English, French, Spanish, German and Italian. A collection of terminological resources
Babylon MTMiscellaneousMultilingualMachine translation system
Google TranslateMiscellaneousMultilingualMachine translation system
Stars21MiscellaneousMultilingualSpell-checker. Includes Russian
InfocinaBilingual dictionaryMultilingualMain language: Chinese
YandexMonolingual/bilingual dictionaryRussian
Russian National CorpusCorpusRussian
Dic.academic.ruDictionary - miscellaneousRussianMonolingual dictionary and encyclopaedia
Feb-web Russian dictionaryMonolingual dictionaryRussian
Tol'kovij Slovar OzegovMonolingual dictionaryRussian
Diccionario panhispánico de dudasMonolingual dictionarySpanishProvided by Real Academia Española
RAE (Real Academia Española)Monolingual dictionarySpanishWebsite of the official royal institution responsible for overseeing the Spanish language
CREACorpusSpanishCorpus de Referencia del Español Actual. Provided by RAE
CLAVEMonolingual dictionarySpanishDiccionario de uso del español actual
Diccionario de colocaciones del españolDictionary of idioms and phrasesSpanish
SM Diccionario Sinónimos y AntónimosSynonyms dictionary/ThesaurusSpanish
El País sinónimos y antónimosSynonyms dictionary/ThesaurusSpanish
Corpus del EspañolCorpusSpanish
DudenMonolingual dictionaryGerman
DWDSMonolingual dictionaryGermanIncludes definitions, synonyms, collocations, usage examples
RedensartenDictionary of idioms and phrasesGerman
Deutsche Bundesbank GlossarGlossary/Terminological databaseGermanDomain: economics and finance
EUFIS glossaryGlossary/Terminological databaseGermanDomain: European Union and economics
Mannheim corporaCorpusGerman
Vocabulary.comDictionary - miscellaneousEnglishIncludes usage examples in specialized contexts (e.g. news, medicine, science, business, etc.)
OneLook Reverse DictionaryMonolingual dictionaryEnglishMakes it possible to identify to concepts/lemmas starting from user-provided definition. Not always efficient.
BiblitGlossary/Terminological databaseMultilingualA large collection of links to specialized dictionaries and glossaries
The 100 best online dictionariesDictionary - miscellaneousEnglishA very thorough list of online English dictionaries and glossaries. From the description: "Sophisticated terminology, regional dialects, obscure slang, comprehensive commentary with guide words — it’s all in here"
BistroGlossary/Terminological databaseMultilingualLegal terminology in Italian, German and Ladin
Sinica Corpus - 中研院漢語平衡語料庫CorpusChinese - MandarinA balanced monolingual corpus of modern Mandarin Chinese (TW traditional) with about 10 million word tokens
Chinese National Corpus - 国家语委现代汉语语料库CorpusChinese - Mandarin A balanced monolingual corpus of modern Mandarin Chinese (PRC Simplified) with about 13 million word tokens
Linguistic Variation in Chinese Speech Communities Corpus (LIVAC) - LIVAC 共時語料庫CorpusChinese - MultiregionalA synchronic corpus of contemporary Chinese media texts from various Chinese-speaking regions with 2.5 billion character tokens
The Lancaster Corpus of Mandarin Chinese (LCMC) - 兰卡斯特汉语语料库CorpusChinese - MandarinA monolingual balanced corpus of modern Mandarin Chinese (PRC) constructed with the same selection criteria as the Freiburg-LOB Corpus of British English (FLOB)