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Open Source API Infrastructure Tools

A curated collection of the best open source infrastructure and tools for managing and securing APIs..

Apache APISIX

High-performance API gateway with built-in LLM support

  • Stars

    17,303

  • Last commit

    2 days ago

  • License

    Apache-2.0
Apache APISIX is an open-source API gateway built on NGINX and etcd, offering dynamic routing, 100+ plugins, load balancing, authentication, and traffic management for APIs and LLM workloads.

Open Source Alternative to:

Kong

Tyk

Universal API management for REST, GraphQL, gRPC & async

  • Stars

    10,879

  • Last commit

    2 days ago

  • License

    Unknown
Fast, scalable API management platform with open source gateway, analytics, dev portal and dashboard. Deploy anywhere with AI-ready governance and security.

Open Source Alternative to:

Kong

Mockoon

Effortless API mocking for seamless development

  • Stars

    8,475

  • Last commit

    2 days ago

  • License

    MIT
Create, run, and share mock REST APIs without coding. Boost productivity with an intuitive interface and powerful features.

Open Source Alternative to:

Postman

UnKey

Secure, scalable API key management for developers

  • Stars

    5,483

  • Last commit

    17 hours ago

  • License

    AGPL-3.0
Streamline API authentication with UnKey's powerful, developer-friendly platform for creating, revoking, and monitoring API keys.

Open Source Alternative to:

Kong

Krakend

Blazing-fast API gateway with linear scalability

  • Stars

    2,702

  • Last commit

    6 days ago

  • License

    Apache-2.0
High-performance, stateless API gateway built for microservices. Handle 80K+ requests/second with transparent pricing and enterprise-grade reliability.

Open Source Alternative to:

Kong

Fusio

API management platform for developers and AI agents

  • Stars

    2,129

  • Last commit

    13 days ago

  • License

    Apache-2.0
Open source API management platform that exposes databases as REST, routes microservice traffic, handles billing, and generates SDKs across multiple languages.

Open Source Alternative to:

Postman

Tailcall

AI
The modern GraphQL runtime

  • Stars

    1,443

  • Last commit

    2 months ago

  • License

    Apache-2.0
Swiftly design and ship best-practice GraphQL backends atop existing data sources and APIs.

Open Source Alternative to:

Apollo GraphQL

WunderGraph

Unify APIs, databases, and services effortlessly

  • Stars

    1,286

  • Last commit

    1 day ago

  • License

    Apache-2.0
A powerful backend framework that simplifies API integration, enhances security, and boosts developer productivity for modern web applications.

Open Source Alternative to:

Apollo GraphQL

Hive

Open-source GraphQL federation platform

  • Stars

    482

  • Last commit

    18 hours ago

  • License

    MIT
A fully open-source schema registry, analytics, and gateway for GraphQL federation and APIs

Open Source Alternative to:

Apollo GraphQL

Gravitee

Unified API, event, and AI agent management platform

  • Stars

    469

  • Last commit

    20 hours ago

  • License

    Apache-2.0
Full-lifecycle API management platform that unifies synchronous and asynchronous ecosystems. Manage APIs, event streams, and AI agents with enterprise security and 4x faster gateway performance.

Open Source Alternative to:

Postman
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