Open source API development ecosystem - https://hoppscotch.io (open-source alternative to Postman, Insomnia)

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.

Mobile Security Framework (MobSF) is an automated, all-in-one mobile application (Android/iOS/Windows) pen-testing, malware analysis and security assessment framework capable of performing static and dynamic analysis.

Hurl, run and test HTTP requests with plain text.

MeterSphere 是新一代的开源持续测试工具，让软件测试工作更简单、更高效，不再成为持续交付的瓶颈。

API, Integration, E2E Testing Agent for Developers that actually work. Generate tests, mocks/stubs for your APIs!

An interactive command-line HTTP and API testing client built on top of HTTPie featuring autocomplete, syntax highlighting, and more. https://twitter.com/httpie

Test Automation Made Simple

Newman is a command-line collection runner for Postman

Friendly and fast tool for sending HTTP requests

HTTP parameter discovery suite.

A payment application to demonstrate real-world usage of Cypress testing methods, patterns, and workflows.

Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.

Free and open-source API Client & Interceptor.

🚀 HTTPie Desktop — cross-platform API testing client for humans. Painlessly test REST, GraphQL, and HTTP APIs.

Catch API bugs before your users do

Offline-First Minimalistic HTTP & Socket Testing Client for the Web & Desktop

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.

☔ 敏捷开发最强大易用的接口工具，机器学习零代码测试与 AI 问答、生成代码与静态检查、生成文档与光标悬浮注释，腾讯、华为、SHEIN、传音、工行等使用 ☔ The most advanced tool for HTTP API. Machine learning no-code testing and AI assistant, generating codes and static analysis, generating comments and floating hints. Used by Tencent, Huawei, SHEIN, TRANSSION, ICBC, etc.