Insomnia is an API development platform for HTTP, REST, GraphQL, gRPC, SOAP, and WebSockets.

OpenAPI.Tools is an open-source directory listing high-quality, community-driven tools for working with the OpenAPI Specification.

Mockaroo is a test data generator and API mocking tool for developers and testers.

WireMock is the best tool for API mocking and is used by developers to create stable, predictable development environments.

Beeceptor is the best API mocking tool for developers and is used by software teams to streamline testing and debugging processes.