U-Dictionary - U-Dictionary is one of the sleekest dictionary applications, which helps in removing the language hurdles for its users and is available in 12 different languages.
The Free Dictionary - The World's most comprehensive free online dictionary, thesaurus, and encyclopedia with synonyms, definitions, idioms, abbreviations, and medical, financial, legal specialized dictionaries
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
RhymeBook - RhymeBook is one of the best application that helps its users to find out the whole rhyme if they know some words of rhyme.
English to Urdu Dictionary - English to Urdu Dictionary is one of the best language learning application which emphasis on pronunciation of difficult words.
WordReference - WordReference is a free online Oxford dictionaries for Spanish, French, Italian, German and more.