OpenAPI (f.k.a Swagger) Specification code generator. Supports C#, PowerShell, Go, Java, Node.js, TypeScript, Python
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Instant REST and MCP APIs for PostgreSQL and MySQL, on existing or new databases. CRUD, custom SQL routes, auth and ACL without writing a backend. Low-code, ⚡ realtime, high-performance. Native MySQL support since v2.5
Connexion is a modern Python web framework that makes spec-first and api-first development easy.
Huma REST/HTTP API Framework for Golang with OpenAPI 3.1
Input OpenAPI. Output SDKs and Docs.
Library for OpenAPI 3 with spring-boot
Catch API bugs before your users do
A fast, lightweight and more productive microservices framework
🕸️ GraphQL Federation Framework for any API services such as REST, OpenAPI, Swagger, SOAP, gRPC and more...
A flexible JSON/YAML linter for creating automated style guides, with baked in support for OpenAPI (v3.1, v3.0, and v2.0), Arazzo v1.0, as well as AsyncAPI v2.x.
Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.
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.
A REST API library with better functionality, performance, and scalability than refit
Self-Hosted API Management for Builders
The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀
Bichon – A lightweight, high-performance Rust email archiver with WebUI
The Standard Webhooks specification
DreamFactory is a secure, self-hosted enterprise data access platform that provides governed API access to any data source, connecting enterprise applications and on-prem LLMs with role-based access and identity passthrough.
Golang Fuego - Web framework generating OpenAPI 3 spec from source code - Pluggable to existing Gin & Echo APIs
🦎 A lightweight, streaming-native, multi-protocol gateway for AI, APIs, and real-time data. Route LLM requests across providers, govern MCP tools, and connect Kafka, MQTT, and HTTP through one high-performance engine with shared security and observability.
⚒️ Redocly CLI makes OpenAPI easy. Lint/validate to any standard, generate beautiful docs, and more.
GUI / visual editor for creating and editing OpenAPI / Swagger definitions