Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms
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.
Reji - Improve your vocabulary hassle-free 📚
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
Vocly - Learn vocabulary in 50 languages with fun games