API Development & Testing

🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern REST API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

The Cloud Native Application Proxy

A unified AI model hub for aggregation & distribution. It supports cross-converting various LLMs into OpenAI-compatible, Claude-compatible, or Gemini-compatible formats. A centralized gateway for personal and enterprise model management. 🍥

Free, open-source local AWS emulator.

The Cloud-Native API Gateway and AI Gateway

A lightweight AWS service emulator written in Go

AI gateway, registry, and proxy for MCP, A2A, and REST/gRPC APIs.

OpenAPI code generator for API clients, server stubs, and documentation.

Envoy-based MCP gateway with auth and policy integration.

Open-source API development suite for contract-first testing and specification-driven workflows.

Deterministic correctness testing for MCP servers.

The Cloud-Native API Gateway and AI Gateway

Lightweight self-hostable API client with no cloud or telemetry.

An interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers.

🤖 AI Gateway | AI Native API Gateway

Open-source MCP gateway for enterprise AI.

AI-first IDE for QA and API testing.

Testcontainers for Go is a Go package that makes it simple to create and clean up container-based dependencies for automated integration/smoke tests. The clean, easy-to-use API enables developers to programmatically defi

Open-source HTTP benchmarking platform for testing and proving API performance.

🦍 The API and AI Gateway

Open-source cross-platform functional testing tool for APIs, SOAP services, REST endpoints, and web services.

Tyk Open Source API Gateway written in Go, supporting REST, GraphQL, TCP and gRPC protocols

Native AI gateway and LLM proxy built in Rust.

API Dash is a beautiful AI-powered open-source cross-platform (Desktop & Mobile) API Client built using Flutter which can help you easily create & customize your HTTP & GraphQL API requests, visually inspect responses and generate API integration code. A lightweight alternative to postman/insomnia.

justoneapi数据接口服务。提供：淘宝、小红书、拼多多、同程旅行、京东外卖、抖音（电商）、美团、抖音（视频）、快手、蒲公英、星图、微信公众号、大众点评、哔哩哔哩、知乎、微博、贝壳、Bigo、Temu、Lazada、Shopee、SHEIN、百度指数、携程、Boss直聘、智联招聘、拉钩、今日头条、Facebook、Youtube、Instgram、Twitter。爬虫、采集、scrapy、接口、API。

A Cloud Native traffic orchestration system

Unified OpenAI-compatible AI gateway with workflows and monitoring.

Webhook gateway for sending, managing, and routing webhooks.

API laboratory for designing and testing API workflows.

Ultra performant API Gateway with middlewares. A project hosted at The Linux Foundation

Cloud native, ultra-high performance AI&API gateway, LLM API management, distribution system, open platform, supporting all AI APIs.🦄云原生、超高性能 AI&API网关，LLM API 管理、分发系统、开放平台，支持所有AI API，不限于OpenAI、Azure、Anthropic Claude、Google Gemini、DeepSeek、字节豆包、ChatGLM、文心一言、讯飞星火、通义千问、360 智脑、腾讯混元等主流模型，统一 API 请求和返回，API申请与审批，调用统计、负载均衡、多模型灾备。一键部署，开箱即用。

Offline-first HTTP and socket API testing client for web and desktop.

Open-source developer portal for API productization and monetization.

Next-generation AI model API aggregation and distribution system.

API 200 is an open source API gateway to simplify 3rd-party integrations. Import endpoints, set up caching, retries, and mocks. Access all services via one URL. Monitor logs, track errors, and get alerts on API incidents.

No-code API wrapper for databases.

Travel technology solution with client portal for flight booking and admin dashboard.

Extensible API management platform.

Open-source test automation tool for web, mobile, and API testing.

Open-source cross-platform API test and design client.