awesome-http-clients

Tool for integration testing a variety of APIs

Free and open source API testing tool

(macOS, Linux) - Simple yet powerful HTTP client

(macOS) - A Playground for API Development

Fast and git-friendly open-source API client

(macOS) - A free open source, native Apple OS X app for testing HTTP/REST endpoints

A fast, lightweight and open-source desktop application to make HTTP(s) requests

Web debugging proxy for MacOS, Windows, and Linux

API platform for GraphQL, REST, SocketIO and WebSocket

(Linux) - Application to send HTTP requests to test your API endpoints

Open-source HTTP(S) debugging proxy, analyzer & client

(Windows) - Professional Windows tool for HTTP testing and debugging

Generate tests for your web APIs in minutes

API client for GraphQL, REST, and gRPC

Insomnium

100% local and privacy-focused fork of Insomnia 2023.5.8

gRPC and REST client; Calling APIs made easy

Milkman

An Extensible Request/Response Workbench

(Windows) - A modern, resource-efficient REST API client for Windows

(macOS) - Fast and feature rich native macOS application

Complete API development environment

RESTClient

RESTClient is a Java application to test RESTful web services

Requester

Powerful, modern HTTP/REST client for SublimeText

(Linux) - a simple http/rest testing tool built to fit right in with your existing Gnome setup; built with D and GtkD

(Linux) - Fully customizable way to test your APIs; native GTK

Tool for working with an API and creating automated API tests

A lightweight Rest API Client Extension for VS Code

(Windows) - Powerful and simple REST and SOAP tools for developers and testers

Wisdom rest-client

A tool for automated testing REST API

Yaak helps you interact with REST, GraphQL, and gRPC and Websocket

friflo POST

HTTP Client for VS Code to POST JSON, XML, image, ... files to REST APIs

A command-line tool for transferring data with URL syntax

Modern, user-friendly command-line HTTP client

The power of curl, the ease of use of httpie

API Interaction with history, collections and more

Open source API development ecosystem

RESTer

Browser extension REST client for almost any web service

Simple browser-based REST client can be installed as Chrome app

WebExtension that permits to test and analyze HTTP request directly from you browser

Stoplight is an API Design, Development, and Documentation platform

Design, describe, and document APIs on open source editor dedicated to OpenAPI-based APIs

(Android) - Test Rest APIs with your phone

(Android) - A simple tool for sending customized HTTP requests and viewing responses

(iOS) - Make requests & debug APIs on the go

An App for developers to test REST API

(iOS) - The simplest App Debugger for iOS