Reverse Dictionary - Describe a concept and get back a list of words
Wordd - Quickly look up vocabulary, abbreviations, acronyms, slang
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.
Eunoia - Words that don't translate
Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms
Crosswords Arena - Word game, multiplayer and computer players