Urban Dictionary - Urban Dictionary is a Web-based dictionary of slang words and phrases.
Forvo - Forvo: the largest word pronunciation dictionary in the world, now with translations.
Slang-Dictionary.org - Slang-Dictionary is a web-based database for searching through the database of slang words and learn how different words are getting different meanings in different countries of the world.
Howjsay - Pronounce words correctly with the world’s largest English pronouncing dictionary.
Dictionary.com - Dictionary.com is the world’s leading digital dictionary. We provide millions of English definitions, spellings, audio pronunciations, example sentences, and word origins.
Shtooka - The Shtooka Project is a multilingual database of audio recordings of words and sentences.