mockd
Open-source multi-protocol mock server supporting HTTP, gRPC, GraphQL, WebSocket, MQTT, and SOAP with chaos engineering and proxy recording.
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MockServer github.com
Mocking, debugging proxy and chaos engineering tool for multiple protocols (HTTP, gRPC, GraphQL, LLM, MCP, Kafka, TCP and more); mock any dependency, record/replay and inspect traffic, verify requests, and inject faults. Docker, JAR, Helm, multi-language clients.
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Mockoon (⭐8.4k) github.com
A user-friendly tool for designing and running mock REST APIs with real-time simulation and easy setup.
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Microcks microcks.io
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Mocky (⭐2k) github.com
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MockBase mockbase.org
Hosted mock server for REST, GraphQL, and SOAP with fault injection, stateful mocks, and OpenAPI import.
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Mockable mockable.io
An easy-to-configure service for creating custom HTTP responses, ideal for rapid prototyping and testing.
GraphQL › Tools > Tools - Testing, Prototyping & Mocking: “Multi-protocol mock server with GraphQL schema mocking, resolver configuration, and query validation. Also supports HTTP, gRPC, WebSocket, MQTT, and SOAP.”
MQTT › Tools: “Multi-protocol mock server with a built-in MQTT broker supporting QoS 0-2, retained messages, topic patterns, and device simulation for IoT development and testing.”
Testing › Software > Service Virtualization: “Open-source multi-protocol mock server supporting HTTP, gRPC, GraphQL, WebSocket, MQTT, and SOAP with chaos engineering and proxy recording.”