ManyThings.org - ManyThings is a multiplatform and user friendly application for students of ESL or EFL to learn the meanings and definitions of different terms and phrases.
Forvo - Forvo: the largest word pronunciation dictionary in the world, now with translations.
SlangSite.com - SlangSite.
PronounceItRight - PronounceItRight, establishes order in the huge phonetic mess of global communications.
InternetSlang.com - InternetSlang.
Howjsay - Pronounce words correctly with the world’s largest English pronouncing dictionary.