Arepresentational state transfer (REST)API is a way to provide compatibility between computer systems on the internet. The concept was first outlined in a dissertation by Roy Fielding in 2000.

Open source API development ecosystem -https://hoppscotch.io (open-source alternative to Postman, Insomnia)

• UpdatedOct 7, 2025
• TypeScript

🔥 🔥 🔥 Open Source Airtable Alternative

• UpdatedOct 7, 2025
• TypeScript

🔥 🔥 🔥 Open Source JIRA, Linear, Monday, and Asana Alternative. Plane helps you track your issues, epics, and cycles the easiest way on the planet.

• UpdatedOct 7, 2025
• TypeScript

⚡️ Express inspired web framework written in Go

• UpdatedOct 7, 2025
• Go

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

• UpdatedOct 7, 2025
• JavaScript

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

• UpdatedOct 7, 2025
• TypeScript

🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.

• UpdatedDec 17, 2024
• Python

A cloud-native Go microservices framework with cli tool for productivity.

• UpdatedOct 7, 2025
• Go

Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.

• UpdatedOct 6, 2025
• TypeScript

Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

• UpdatedOct 7, 2025
• JavaScript

Send push notifications to your phone or desktop using PUT/POST

• UpdatedSep 25, 2025
• Go

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

• UpdatedOct 7, 2025
• Java

Microsoft REST API Guidelines

• UpdatedAug 11, 2025

Parse Server for Node.js / Express

• UpdatedOct 7, 2025
• JavaScript

lightweight, idiomatic and composable router for building Go HTTP services

• UpdatedSep 17, 2025
• Go

gRPC to JSON proxy generator following the gRPC HTTP spec

• UpdatedOct 7, 2025
• Go

swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.

• UpdatedOct 7, 2025
• Mustache

An opinionated GoLang framework for accelerated microservice development. Built in support for databases and observability.

• UpdatedOct 7, 2025
• Go

Full Modular Monolith application with Domain-Driven Design approach.

• UpdatedJun 4, 2024
• C#

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

• UpdatedOct 7, 2025
• Vue