Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.
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1–19 of 19 · Most stars
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
Ministack: Free, open-source local AWS emulator - 60+ services, Terraform compatible, real databases. Free forever. MIT licensed.
Papercut SMTP -- The Simple Desktop Email Server
The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀
HTTP mocking for Golang
Free, open-source AWS emulator. LocalStack alternative: 107 services, 7,657 operations, true 100% Smithy conformance (257,522/257,522 variants pass). No account, no auth token, no paid tier.
In-page HTTP controller for frontend development. Intercept, modify, and simulate API responses directly in the browser.
DeepfakeHTTP is a web server that uses HTTP dumps as a source for responses.
- http-server
- dump
- dummy
- testing
Betamax is a tool for mocking external HTTP resources such as web services and REST APIs in your tests. The project was inspired by the VCR library for Ruby.
An Apex mocking framework for true unit testing in Salesforce, with Stub API support
Scriptable, multipurpose mock server. Run standalone mock servers, or embed mocks within your tests or CI/CD pipeline.
A .NET library for intercepting server-side HTTP requests
- httpclient
- netstandard
- dotnet
- dotnet-core
A Open Source Mocking framework for Delphi XE2 or later
- delphi
- mocking-framework
- dpmpackage
Go Interface Mocking Tool
A way to simplify your Salesforce data creation and method stubbing.
A simple Elixir package to elegantly mock module functions within (asynchronous) ExUnit tests using Erlang's :meck library
- elixir
- mocking
- exunit
- meck
Open-source simulation harness for testing AI agents. Simulate LLM and tool calls to test edge cases, failure paths, and agent logic without live API calls.
- ai-agents
- ai-testing
- llm
- llm-evaluation
Open-source Modbus RTU/TCP slave simulator for the LRI AEM-60DC8 industrial DC monitor — 147 holding registers, 8 DC channels, 6 baudrates. SCADA/PLC integration testing without hardware.