Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Meaning Monkey - Find the definition and meaning of anything.
Language Learning with Netflix - Use movies as study material for language learning
Reverse Dictionary - Describe a concept and get back a list of words
Word Chain - Word Chain is an application related to words and forming the chains of letters.