Openapi GitHub Repositories (2026) · Open Source Tools

Typesafe APIs Made Simple 🪄

Huma REST/HTTP API Framework for Golang with OpenAPI 3.1

A fast, lightweight and more productive microservices framework

A Burp Suite extension that exposes the full Montoya API as a local REST API, with Swagger UI

The open source, no-code MCP Server for AI-Native API Access

OpenApi or Swagger integration to Laravel

Shuffle: A general purpose security automation platform. Our focus is on collaboration and resource sharing.

Generates documentation for your REST API from attributes

Modern Laravel OpenAPI (Swagger) documentation generator. No PHPDoc annotations required.

Bichon – A lightweight, high-performance Rust email archiver with WebUI

Automate Kubernetes Configuration Editing

⚒️ Redocly CLI makes OpenAPI easy. Lint/validate to any standard, generate beautiful docs, and more.

vacuum is the worlds fastest and most versatile OpenAPI, Arazzo, AsyncAPI & JSON Schema linter, docs generator and toolkit. It tears through API specs at light speed. 100% compatible with Spectral rulesets, and OpenAPI 3.0, 3.1 and 3.2

CUGA is an open-source generalist agent harness for the enterprise, supporting complex task execution on web and APIs, OpenAPI/MCP integrations, composable architecture, reasoning modes, and policy-aware features.

Plugin for converting OpenAPI 3.0 specs to the Postman Collection (v2) format

libopenapi is a fully featured, high performance OpenAPI 3.2, 3.1, 3.0, Overlays and Arazzo parser, library, validator and toolkit for go applications.

The most comprehensive collection of quality OpenAPI tooling, curated by Phil Sturgeon and the team at APIs You Won't Hate.

A Typescript framework to help you get an API server up and running with I/O schema validation and custom middlewares in minutes.

MCP gateway for AI agents: turn any REST/OpenAPI, GraphQL, SOAP or SQL API into MCP tools. 547 ready-made connectors (SAP, ERP, e-commerce) with RBAC, SSO, audit logs and a knowledge graph.

🤖 Generator for GH repo to help you manage the OpenAPI definition lifecycle