Light, fluffy, and always free - The AWS Local Emulator alternative
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A simulation data generator
Open-source platform for creating safe, isolated production sandboxes for API, integration, and E2E testing.
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
- api-simulation
- golang
- proxy
- mitm
The jQuery Mockjax Plugin provides a simple and extremely flexible interface for mocking or simulating ajax requests and responses
Boilerplate-free mocking framework for Swift!
- mock
- mockito
- cuckoo
- stub
Library to send mock remote notifications to the iOS simulator
Replace any .NET method (including static and non-virtual) with a delegate
- testing
- testing-framework
- isolation-framework
- dotnet
Free, open-source AWS emulator. LocalStack alternative: 107 services, 7,657 operations, true 100% Smithy conformance (258,545/258,545 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.
Fake JSON Server is a Fake REST API that can be used as a Back End for prototyping or as a template for a CRUD Back End.
- csharp
- webapi
- dotnet-core
- dynamic
🐵 HTTP mock server, useful to stub services and simulate dynamic API responses, leveraging ASP.NET Core features, built-in fake data generation and pure C# scripting
- csharp
- mock-server
- roslyn
- faker
A Open Source Mocking framework for Delphi XE2 or later
- delphi
- mocking-framework
- dpmpackage
:dash: Simple yet powerful file-based mock server with recording abilities
Bouncy Hsm is a software simulator of HSM and smartcard simulator with HTML UI, REST API and PKCS#11 interface.
- blazor
- blazor-webassembly
- bouncycastle
- cryptography
Go Interface Mocking Tool
HTTP mock for Golang: record and replay HTTP/HTTPS interactions for offline testing
Java binding for Hoverfly
- api-simulation
- service-virtualization
- java
- testing
Mock an SSH server and define all commands it supports (Python, Twisted)
A lightweight Snowflake emulator built with Go and DuckDB for local development and testing
Isolate tests from the real world, inspired by Ruby's VCR.
- elixir
- testing
- integration
🤖 A simulated HTTP server for testing client code with configurable responses.
Feature-rich filesystem mocking for Go tests: comprehensive error injection, latency simulation, write operations, operation statistics, and standalone file handles. Built on testing/fstest.MapFS with comprehensive fs.FS interface support.
- filesystem
- go
- golang
- mock
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