JavaScript.com - A free resource for learning and developing in JavaScript
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
Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms
BundlePhobia - Find the performance impact of adding a npm package to your bundle.
Meaning Monkey - Find the definition and meaning of anything.