tota11y - An accessibility visualization toolkit from Khan Academy
Reverse Dictionary - Describe a concept and get back a list of words
Colorbox.io - Create accessible color systems 🎨
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.
Stark - Contrast check and color blindness simulator for Sketch.
Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms