Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Reverse Dictionary - Describe a concept and get back a list of words
Lingvanex Translator for Slack - Auto-translate messages, documents and images in Slack
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
Inspector Spacetime from Google - Google Translate for engineers working with motion
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.