Merlin is a free extension that you can add to Chrome or Firefox. It uses Open AI's ChatGPT technology to give you access to knowledge from the entire internet with just a few clicks. It can help you summarize long documents, write professional emails, and create content for marketing campaigns. It can also help you master complex Excel formulas and codes by providing suggestions for formulas and codes based on your prompt. Finally, it can convert lengthy documents into shorter and more concise versions so you can get the gist of a document without having to read the entire thing.