Meteor Modeler is a visual design tool specifically crafted for Sequelize, an Object-Relational Mapping (ORM) framework for Node.js. It enables developers to define Sequelize models, fields, and associations through an intuitive graphical interface. Users can enhance their diagrams by adding notes, comments, pictures, and hyperlinks, facilitating a clearer understanding of data structures. The tool also allows for the generation of pixel-perfect diagrams in printable formats, aiding in efficient communication among team members and clients.