Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms
Urban Dictionary - Urban Dictionary is a Web-based dictionary of slang words and phrases.
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.
SlangLang - SlangLang is an editorial dictionary for slang words mainly used on the internet. Here you will find definitions and information about the origin and spread of terms, memes and emotes that are used on the net.
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
The Online Slang Dictionary - Learn thousands of real slang words or add your own.