Mailmerge-JS is an open-source package and AI-enhanced command line tool designed to simplify the process of drafting and sending personalized, templated emails. It's designed to work directly from a user's Gmail inbox, eliminating concerns about email templating and data massaging. Users can effortlessly implement highly personalized email campaigns due to the AI-driven automation of the tool. It can be set up and installed via npm, a well-known package manager for the JavaScript programming language. In addition to boasting a user-friendly appeal, Mailmerge-JS stands out through its commitment to open-source ethos, allowing for contributions via its GitHub repository, which provides the source code. The tool, developed by charlesyu108 & ryanhuang519, empowers users to automate Gmail processes, facilitating more efficient and effective email marketing campaigns or routine correspondence. Users are also supported by a terms and privacy policy, ensuring usage transparency.