Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms
Grammarly - Clear, effective, mistake-free writing everywhere you type.
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.
Synonymful - Improve your vocabulary and communicate like a pro.
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
TabComplete - Secure Autocomplete for Chrome