Eris is a free Chrome add-on developed by Gugustinette that offers a new way of creating, managing, and sharing user interfaces (UIs) for websites. With Eris, users can easily design and customize UIs to enhance the user experience of their websites.

The main feature of Eris is its intuitive interface that allows users to drag and drop elements to create UIs without any coding knowledge. It provides a wide range of pre-designed templates and components, making it easy to create professional-looking UIs in no time. Users can also customize the appearance and behavior of the elements to match their website's branding and functionality.

Another notable feature of Eris is its collaboration capabilities. Users can easily share their UIs with others, allowing for seamless collaboration and feedback. This makes it ideal for web developers, designers, and teams working on website projects.

Overall, Eris is a valuable tool for anyone looking to enhance the UI of their websites. Its user-friendly interface, extensive customization options, and collaboration features make it a must-have for web development projects.