hoppscotch / hoppscotch

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

usebruno / bruno

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

Kong / insomnia

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

OpenAPITools / openapi-generator

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

scalar / scalar

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern REST API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

NangoHQ / nango

Connect your agents & product to 1,000 APIs.

oapi-codegen / oapi-codegen

Generate Go client and server boilerplate from OpenAPI 3 specifications

massCodeIO / massCode

A free, open-source developer workspace. Snippets, notes, HTTP requests, calculations, and dev tools in one local-first app.

requestly / requestly

Community hub for Requestly API Client — bugs, feature requests, and roadmap. The privacy-first Postman alternative.

makenotion / notion-sdk-js

Official Notion JavaScript Client

hey-api / hey-api

👨‍🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode, PayPal, AWS, Autodesk, and many more.

Julien-cpsn / ATAC

A simple API client (postman like) in your terminal

php-curl-class / php-curl-class

PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs

cortex-docs / cortex

Cortex - Generates interactive API documentation, typed SDKs, and MCP servers from OpenAPI, AsyncAPI, GraphQL, gRPC, OpenRPC, and Markdown.

Ovi / DummyJSON

DummyJSON.com provides different types of REST Endpoints filled with JSON data which you can use in developing the frontend with your favorite framework and library without worrying about writing a backend.

foss42 / apidash

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.

flawiddsouza / Restfox

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

huggingface / huggingface.js

Use Hugging Face with JavaScript

ramnes / notion-sdk-py

Notion API client SDK, rewritten in Python! (sync + async)

Kong / insomnia-mockbin

Insomnia Mockbin is the underlying backend for the API mocks capability of Insomnia. It is built and used by Kong, the author of the open-source Kong Gateway.

unkn0wn-root / resterm

Terminal API client for HTTP, GraphQL, gRPC, WebSocket and SSE. Plain .http files you can diff and version, with scripted tests, workflows, mocks, recorder, and a CLI runner for CI.

VoidenHQ / voiden

Design, Test and Document APIs in plain Markdown. Compose Requests with API blocks. Reuse, Replace & Version everything just like code. Offline, Truly Git Native, No Lock-in.

brainboxdotcc / DPP

C++ Discord API Bot Library - D++ is Lightweight and scalable for small and huge bots!

algolia / algoliasearch-client-javascript

⚡️ A fully-featured and blazing-fast JavaScript API client to interact with Algolia.

Art-of-WiFi / UniFi-API-client

A PHP API client class to interact with Ubiquiti's UniFi Controller API

Art-of-WiFi / UniFi-API-browser

Tool to browse data exposed by Ubiquiti's UniFi Controller API

stepci / awesome-api-clients

List of awesome API clients. Postman and Insomnia alternatives

halcy / Mastodon.py

Python wrapper for the Mastodon ( https://github.com/mastodon/mastodon/ ) API.

atymic / twitter

Twitter API for Laravel 5.5+, 6.x, 7.x & 8.x

sieblyio / binance

Node.js & JavaScript SDK for Binance REST APIs & WebSockets, with TypeScript & browser support, integration tests, beautification & more.

twurple / twurple

Interact with Twitch's API, chat and subscribe to events via PubSub and EventSub.

chapar-rest / chapar

Fast, native API client for REST, gRPC, WebSocket and GraphQL. A local-first Postman alternative written in Go: no Electron, no account, no cloud.

mrusme / neonmodem

Neon Modem Overdrive (https://tty.fail/mrus/neonmodem)

algolia / algoliasearch-client-php

⚡️ A fully-featured and blazing-fast PHP API client to interact with Algolia.

AnswerDotAI / ghapi

A delightful and complete interface to GitHub's amazing API

openapistack / openapi-client-axios

JavaScript client library for consuming OpenAPI-enabled APIs with axios

nodevault / node-vault

Client for HashiCorp's Vault

api-bricks / api-bricks-sdk

SDKs for CoinAPI & FinFeedAPI

rmartin16 / qbittorrent-api

Python client implementation for qBittorrent's Web API

slightbasebo / fragment-api-dev

Free Telegram Stars & Premium API. Async Python SDK, aiogram/Node starters, wallet-signed checkout, GRAM/USDT. No API key, 0% API fee.

FoxyFuck / roblox-cloud-metrics-cli

Roblox Analytics Automation Toolkit 2026: Python Open Cloud Query CLI with CSV JSON Export

weihubeats / RustFox

A high-performance, local-first API client & Postman alternative built with Rust, Tauri 2, and Vue 3.高性能、本地优先的 API 调试与测试客户端 (Postman/Insomnia/ApiFox 替代品)，基于 Rust + Tauri 2 + Vue 3 打造。

zaineb76 / Dark-Vision-Trainer-Mobile

Best Night Vision Training App 2026: Open Source Dark Adaptation Trainer for Low Light Vision

Kensmile / Dark-Vision-Trainer-Mobile

Best Night Vision Training App 2026: Open Source Dark Adaptation Trainer for Low Light Vision

yakisoba0728 / korail-mobile-api

코레일+(구 코레일톡) 앱과 같은 요청을 보내는 비공식 Python 클라이언트

tigusigalpa / socialkit-go

Production-ready Go SDK for the SocialKit REST API. Build reliable integrations for YouTube, TikTok, Instagram, Facebook, X/Twitter, LinkedIn, and video workflows with typed models, context-aware requests, secure header authentication, retries, pagination, response metadata, and async downloads, plus production-safe error handling.

devgyurak / pykorail

🚄 KTX 표, 파이썬이 끊습니다 — 열차 조회 · 예매 · 결제 · 환불 · 예약대기 · 취소표 감시를 코드 몇 줄로. 코레일톡 API 비공식 Python SDK (Unofficial Korail / KTX API client)

kowalski76057 / cf-turnstile-token

Scriptable Cloudflare Turnstile token CLI via the Peak API - sitekey discovery, solve, and token output for CI and automation.

icyberdeveloper / tbank-mcp

Unofficial MCP server for T-Bank (Т-Банк, ex-Tinkoff) mobile banking: accounts, cards, transfers, bill pay, grocery ordering, tickets & travel — for Claude Code and any MCP client.