Reverse Dictionary - Describe a concept and get back a list of words
A.I. Experiments by Google - Explore machine learning by playing w/ pics, music, and more
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
BundlePhobia - Find the performance impact of adding a npm package to your bundle.
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.
JavaScript.com - A free resource for learning and developing in JavaScript