hoppscotch / hoppscotch

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

cypress-io / cypress-realworld-app

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

stoplightio / prism

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

flawiddsouza / Restfox

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

apideck-libraries / portman

Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman 👨🏽‍🚀

trueleaf / apiflow

A modern API workspace that works both online and offline — combining API documentation, testing, mock, and AI-powered automation in one lightweight tool

serenity-js / serenity-js

A TypeScript-native acceptance testing framework that gives your Playwright Test, WebdriverIO, or Cucumber test suite the architecture it needs to scale.