Integration

Dredd (.2k)

A language-agnostic command-line tool for validating API documentation against backend implementation.

OpenApi Generator

Automatically generates API client libraries, server stubs, and documentation from OpenAPI specifications.

Spectral (k)

A flexible JSON/YAML linter for creating automated style guides, with baked-in support for OpenAPI, AsyncAPI, and Arazzo.

Swagger Editor (.4k)

A browser-based editor for designing, editing, and visualizing OpenAPI, AsyncAPI, and API Design Systems specifications.

RapiDoc (.8k)

A lightweight WebComponent for rendering interactive OpenAPI/Swagger documentation with built-in API testing capabilities.

ReDoc

Generate beautiful, responsive API documentation from OpenAPI/Swagger definitions.

Slate

A static API documentation generator that creates beautiful, responsive documentation sites from Markdown files.

Stoplight Elements (.3k)

Build beautiful, interactive API documentation with embeddable React or Web Components, powered by OpenAPI and Markdown.

Grape Swagger UI

Dynamically generates interactive API documentation from OpenAPI/Swagger specifications.

Apinto (.6k)

A high-performance, extensible, cloud-native API gateway built with Go, featuring plugin-based architecture and enterprise-grade management.

Apache APISIX (k)

A dynamic, real-time, high-performance cloud-native API gateway and AI gateway for traffic management and service orchestration.

Apache ShenYu (.7k)

A Java-native, high-performance API gateway for microservices, offering service proxy, protocol conversion, and comprehensive API governance.

Envoy Gateway (.6k)

An open-source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway using Gateway API resources.

KrakenD API Gateway (.5k)

An ultra-high performance, stateless, declarative API Gateway written in Go for microservices and secure communications.

Ocelot

A .NET API Gateway for microservices architectures, providing routing, authentication, and load balancing.

Traefik API Gateway (k)

A modern HTTP reverse proxy and load balancer that automatically configures itself for microservices.

Tyk API Gateway

A cloud-native, open source API gateway written in Go, supporting REST, GraphQL, TCP, and gRPC protocols.

Bruno

An open-source, offline-first API client that stores collections as files for Git-based collaboration.

curl (k)

A command-line tool and library for transferring data with URLs, supporting over 25 protocols including HTTP, FTP, SSH, and WebSocket.

curlie

A curl frontend with HTTPie's user-friendly interface, combining curl's power with intuitive syntax and formatting.

gRPC UI

A command-line tool that provides an interactive web UI for testing and debugging gRPC servers, similar to Postman for gRPC APIs.

gRPCurl

A command-line tool for interacting with gRPC servers, similar to curl but for gRPC.

HTTPie

A modern, user-friendly command-line HTTP client for testing, debugging, and interacting with APIs.

Hoppscotch

An open-source API development ecosystem for testing HTTP, WebSocket, GraphQL, and other APIs with real-time collaboration.

Insomnia

An open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE, gRPC, and other HTTP-compatible protocols.

posting (k)

A terminal-based HTTP client for keyboard-centric API testing and development workflows.

Requestly

A local-first API client and HTTP interceptor for building, testing, and mocking APIs directly in your browser or desktop.

resty

A tiny shell script wrapper for curl that provides a simple command-line interface for interacting with REST services in pipelines.

SoapUI (.6k)

A free and open-source cross-platform functional testing solution for APIs and web services.

xh

A friendly and fast command-line HTTP client with an intuitive syntax, designed as a high-performance alternative to HTTPie.

Yaade (.9k)

An open-source, self-hosted, collaborative API development environment for teams to securely manage and share API collections.

Yaak (k)

A fast, privacy-first desktop API client for REST, GraphQL, WebSockets, SSE, and gRPC.

kcat (.7k)

A lightweight command-line tool for producing, consuming, and inspecting Apache Kafka messages, similar to netcat for Kafka.

Service Bus Explorer (.1k)

A Windows desktop tool for connecting to and administering Azure Service Bus messaging entities with advanced testing and management features.

hoverfly

A lightweight open-source API simulation tool for creating realistic mocks of dependent services during development and testing.

Microcks (.8k)

A Kubernetes-native open-source platform for API mocking and contract testing from OpenAPI, AsyncAPI, gRPC, GraphQL, and Postman assets.

Mockoon (.1k)

The easiest and quickest way to design and run mock APIs locally, with desktop, CLI, and cloud options.

MockServer (.8k)

MockServer is an HTTP(S) mock server and proxy for mocking, recording, and debugging integrations with external systems.

Mocky (k)

A simple tool to generate custom HTTP responses for testing web services and mocking backend APIs.

Prism (.8k)

Open-source API mocking and contract testing server for OpenAPI and Postman specifications.

WireMock (.1k)

A flexible open-source tool for mocking HTTP services to create stable test and development environments.

Apache JMeter (.2k)

An open-source Java application for load testing and performance measurement of web services, databases, and various network protocols.

gatling

An open-source load testing platform for modern performance engineering with code-first test definition and asynchronous architecture.

Hurl

A command line tool to run and test HTTP requests using a simple plain text format.

Keploy

Open-source API and integration testing platform that auto-generates tests and mocks from real user traffic using eBPF.

ghz (.3k)

A command-line tool for load testing and benchmarking gRPC services with support for various schedules and output formats.

k6

A modern load testing tool for developers, using Go and JavaScript to test performance like unit tests.

Karate (.8k)

A unified open-source framework combining API testing, mocks, performance testing, and UI automation with a simple syntax.

rest-assured

A Java DSL for simplifying testing and validation of REST APIs with a fluent, Groovy-like syntax.

RESTler

A stateful REST API fuzzing tool that automatically tests cloud services to find security and reliability bugs.

Schemathesis

Automatically generate thousands of test cases from OpenAPI or GraphQL schemas to find edge-case API bugs.

Taurus (.1k)

Automation-friendly framework for continuous testing that wraps JMeter, Gatling, Locust.io, and Selenium WebDriver.