Open-source API tools. To compare with PasteSheet.

Hoppscotch

API Tools

Helps you create requests faster, saving precious time on development.

Bruno

API Tools

Bruno is the Git-native API client for REST, GraphQL, gRPC and Websocket. A local and open

Kong

API Tools

🦍 The API and AI Gateway

Insomnia

API Tools

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. Wi

Hasura

Backend as a Service

Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access cont

OpenAPI Generator

API Tools

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs

Yaak

API Tools

The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Ser

Apache APISIX

API Tools

The Cloud-Native API Gateway and AI Gateway

Scalar

API Tools

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern RES

OpenWA

API Tools

OpenWA - The free, open source WhatsApp API Gateway with a pluggable architecture. Self-ho

Nango

API Tools

Connect your agents & product to 1,000 APIs.

Tyk

API Tools

Open Source API and AI Gateway supporting REST, GraphQL, TCP, gRPC and MCP (Model Context

Higress

API Tools

🤖 AI Gateway | AI Native API Gateway

Karate

Testing & QA

Test Automation Made Simple

Mockoon

API Tools

Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no

Newman

API Tools

Newman is a command-line collection runner for Postman

Requestly

API Tools

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

Unkey

API Tools

The Developer Platform for Modern APIs

pREST

Backend as a Service

PostgreSQL ➕ REST, low-code, simplify and accelerate development, ⚡ instant, realtime, hig

Cortex Docs

API Tools

Cortex - Generates interactive API documentation, typed SDKs, and MCP servers from OpenAPI

API Dash

API Tools

API Dash is a beautiful AI-powered open-source cross-platform (Desktop & Mobile) API Clien

DummyJSON

API Tools

DummyJSON.com provides different types of REST Endpoints filled with JSON data which you c

Restfox

API Tools

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

KrakenD

API Tools

KrakenD Community Edition: High-performance, stateless, declarative, API Gateway written i

Insomnia Mockbin

API Tools

Insomnia Mockbin is the underlying backend for the API mocks capability of Insomnia. It is

Resterm

API Tools

Terminal API client for HTTP, GraphQL and gRPC. Plain .http files you can diff and version

Voiden

API Tools

Design, Test and Document APIs in plain Markdown. Compose Requests with API blocks. Reuse,

A simple API client (postman like) in your terminal

ESB, SOA, REST, APIs and Cloud Integrations in Python

AnythingMCP

AI Infrastructure

Open-source, self-hosted MCP gateway: turn any REST/OpenAPI, SOAP, GraphQL, OData or SQL A

Chapar

API Tools

Chapar is a simple and easy to use api testing tools aims to help developers to test their

The power of curl, the ease of use of httpie.

Create full-fledged APIs for slowly moving datasets without writing a single line of code.

CodeChat

API Tools

CodeChat - WhatsApp Api

RustMailer

Email Clients & Servers

A self-hosted Email Middleware for IMAP, SMTP, Gmail API, Graph API — built for developers

Firecamp

API Tools

Developer-first OpenSource API DevTool, Postman/Insomnia alternative.

HTTPie CLI

API Tools

🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON supp

Notion API Worker

CMS

Notion as CMS with easy API access

ApiArk

API Tools

Privacy-first API platform built with Tauri v2. No login, no cloud, ~60 MB RAM. A lightwei

DBAPI

API Tools

Build rest API with SQL in one minute

Ain

API Tools

A HTTP API client for the terminal

HTTPie Desktop

API Tools

🚀 HTTPie Desktop — cross-platform API testing client for humans. Painlessly test REST, Gr

Orange API Gateway

API Tools

OpenResty/Nginx Gateway for API Monitoring and Management.

Mocky

API Tools

Generate custom HTTP responses, the simpler way to test your Web Services

Step CI

Testing & QA

Automated API Testing and Quality Assurance

VulcanSQL

API Tools

Data API Framework for AI Agents and Data Apps

A framework for building integrations and APIs