Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms
Qikipedia - Instant Wikipedia summary cards on any web page
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.
Six Degrees of Wikipedia - Find the shortest path between two subjects
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
Newsit - Find the discussion around the page you're looking at!