GoldenDict

GoldenDict is an open-source dictionary program for PC computers that gives translations of words and phrases for different languages. It allows use of several popular dictionary file formats simultaneously.

Open Source Freemium Mac OS X Windows Linux Android

Google Dictionary

Google's dictionary extension on Google Chrome. With it, you can double-click any word to view its definition in a small pop-up bubble, or search the complete definition of any word or phrase using the address bar dictionary.

Free Chrome OS Chrome

Dictionary.com

The free Dictionary.com app delivers content from Dictionary.com and Thesaurus.com, including nearly a million words and definitions and 90,000 synonyms and antonyms.

Free Android iPhone Web Windows Phone

Artha

Artha is a handy thesaurus based on WordNet with distinct features like global hotkey look-up, passive desktop notifications, regular expression based search, etc..

Free Open Source Windows Linux

WordReference

WordReference is a free online Oxford dictionaries for Spanish, French, Italian, German and more. Conjugations, audio pronunciations and forums for your questions.

Freemium Android iPhone Web

StarDict

StarDict is a Cross-Platform and international dictionary Software. It has powerful features such as "Glob-style pattern matching", "Scan selection word," "Fuzzy query," etc. Stardict Version3.

Free Open Source Mac OS X Windows Linux Web AmigaOS

Wiktionary

Wiktionary is a multilingual, web-based project to create a free content dictionary, available in 158 languages.

Free Open Source Android Web

Apple Dictionary

Your Mac also comes with a versatile Dictionary application. It also includes to other reference libraries such as thesaurus, Apple glossary, and Wikipedia.

Free Personal Mac OS X

Merriam-Webster

Free online dictionary, thesaurus, spanish-english and medical dictionaries, audio pronunciations, Word of the Day, word games, and many more high-quality Merriam-Webster language resources. Merriam Thesaurus online https://www .

Free Android iPhone iPad Web

Reference.com

reference.com offers a massive online dictionary, thesaurus, encyclopedia, quote finder, and translator (powered by google translate)- all for free. for the dictionary.com and thesaurus.com mobile app, go here. http://alternativein .

Free Web

Wordnik

Wordnik wants to be a place for all the words, and everything known about them.

Free Web

Wordo

Wordo.co is the clean and social dictionary, loved by word-geeks, Wiktionary enthousiasts and students.

Free Web

The Free Dictionary

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus...

Freemium Android iPhone Android Tablet Web

Dixio

Dixio is the solution for all those who care about their language Who want to learn more and enrich their vocabulary: when you receive a presentation or prepare a document, when you are reading in Internet or preparing your curriculum...

Freemium Windows Android iPhone iPad Web

Blueseal Dictionary

Comprehensive dictionary of English, German, Spanish and French including synonyms.

Free Mac OS X Windows Linux Android iPhone Chrome OS Web Blackberry

QwickUp

Access all your favorite dictionaries and other lookup services in one place. Firefox and Chrome extension are available to easily select and lookup any text in web pages.

Free Web Firefox

Glosbe

Huge collaborative massively multilingual dictionary.

Free Personal Web

xFarDic

xFarDic is a comprehensive multilingual dictionary developed using GTK2, wxWidgets, libxml2, under GNU/Linux and relesed under GNU/GPL. It can be installed and used in different RPM and Debian based distros.

Free Open Source Linux

purple

Dictionary from the Elementary project.

Free Open Source Linux

SpanishDict

SpanishDict is a Spanish-learning website that offers a Spanish to English dictionary, a Spanish-English translator, video lessons, flashcards, and more.

Free Android iPhone Web