Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
Reji - Improve your vocabulary hassle-free 📚
Reverse Dictionary - Describe a concept and get back a list of words
Synonymful - Improve your vocabulary and communicate like a pro.
Dictionary Anywhere - Dictionary Anywhere is an open-source and easy-to-use browser extension for Mozilla Firefox and Google Chrome that allows you to check definitions easily while browsing the web.
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.