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Mockoon is a powerful, free, and open-source tool designed for building and running mock REST APIs for testing and prototyping. It provides a user-friendly interface that enables developers to define routes, add responses, and configure behaviors effortlessly. By simulating backend services, Mockoon allows teams to work in parallel, significantly improving workflow efficiency and allowing for quicker iterations on frontend development without waiting for backend services to be fully implemented.

With features like the ability to import/export API definitions, create multiple environments, and extend functionalities through customizable scripts, Mockoon is highly versatile for both individual developers and larger teams. It can be run as a desktop application or on a server, enabling seamless collaboration across different environments. Pricing for Mockoon is entirely free, making it an accessible choice for startups and enterprises alike. Its popularity stems from its simplicity, ease of use, and strong focus on developer productivity.