Mocko — Mocks made easy, simulate your REST API for free Pros and Cons

Apidog is an integrated collaboration platform for API documentation, API debugging, API mocking, and API automated testing that combines Postman + Swagger + Mock + JMeter to tackle the data synchronization problem among different systems using a set of systems and a set of data. API debugging, API data mocking, and API automated testing can be directly used without redefining as long as the API documentation is well defined.

Beeceptor is a versatile tool that helps developers or QA professionals to build mock servers, test unreachable code paths, and intercept HTTP requests. It offers a no-code solution for instantly creating hosted mock servers and provides advanced features to power up API development workflow.

Mockoon is a powerful, open-source platform designed to streamline API mocking processes. It offers a comprehensive suite of tools tailored to meet the needs of developers, QA engineers, and teams working with APIs. API Mocking Tools Mockoon provides intuitive and robust API mocking tools, enabling users to create, manage, and test API endpoints effortlessly. With Mockoon, you can simulate complex API behaviors, including request/response cycles, latency, and error handling. This ensures that your application can handle real-world scenarios before going live. CLI for Integration Testing Mockoon's Command Line Interface (CLI) facilitates seamless integration testing. The CLI allows you to automate API mock server operations, making it an ideal tool for continuous integration and deployment (CI/CD) pipelines. By integrating Mockoon into your workflow, you can ensure consistent and reliable testing outcomes across various environments. Cloud Services for Team Collaboration and Deployment Mockoon Cloud Services enhance team collaboration and deployment capabilities. With cloud-based solutions, teams can collaborate in real-time, share mock API configurations, and synchronize changes effortlessly. The cloud platform also supports easy deployment of mock servers, ensuring that your team can access and test APIs from anywhere, anytime. Open Source and Community-Driven As an open-source project, Mockoon benefits from a vibrant community of developers and contributors. This ensures continuous improvement, regular updates, and a wide range of features driven by user needs. The open-source nature of Mockoon also means that it is highly customizable, allowing you to tailor it to your specific requirements.

Mockaroo is a data generator and API mocking tool helps in creating custom CSV, JSON, SQL, and Excel datasets to test and demo software.

WireMock is a-list free API mocking tool that can be run as a standalone server, or in a hosted version via the MockLab managed service.