JavaScript API for Chrome and Firefox
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Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • 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.
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
Friendly and fast tool for sending HTTP requests
Community hub for Requestly API Client — bugs, feature requests, and roadmap. The privacy-first Postman alternative.
The interactive web server
Self-hosted iOS & Android simulator streaming for the whole team
🔪Swiss-army knife for Android testing and development 🔪 ⛺
Trace-native CI/CD for AI agents: grade production traces, cluster failures, freeze them into replayable regression tests, and block PRs that regress. Self-hostable.
Faker is a pure Elixir library for generating fake data.
Open-source self-improving QA agent for software teams. A test harness with memory. Write tests in natural language for web and mobile. agent-qa learns from every run, adapts to UI changes, and catches regressions before you ship.
Typed TypeScript SDK for direct and managed social platform integrations, with capability checks, explicit outcomes, and deterministic testing.
Fast, native API client for REST, gRPC, WebSocket and GraphQL. A local-first Postman alternative written in Go: no Electron, no account, no cloud.
Continuous Regression Testing for Engineering Teams
Keyscope is a key and secret workflow (validation, invalidation, etc.) tool built in Rust
go-test-coverage is a tool designed to report issues when test coverage falls below a specified threshold
A powerful testing framework for ZSH projects
SMTP mock server written on Golang. Mimic any 📤 SMTP server behavior for your test environment with fake SMTP server.
High-performance, multi-protocol mock server. HTTP, WebSocket, gRPC, MQTT, SSE, GraphQL, SOAP in one binary.
DNS mock server written on 💎 Ruby. Mimic any DNS records for your test environment with fake DNS server.
Capture, inspect, and replay webhooks with 90-day history + signature verification. Built on Cloudflare Workers + D1.