- [Kong](https://konghq.com/kong/) - The World’s Most Popular Open Source Microservice API Gateway and Platform. ([Source Code](https://github.com/Kong/kong)) `Apache-2.0``Lua`
- [KrakenD](https://www.krakend.io/) - Open source High-Performance API Gateway. ([Source Code](https://github.com/devopsfaith/krakend)) `Apache-2.0``Go`
- [Para](http://www.paraio.org) - Flexible and modular backend framework/server for object persistence, API development and authentication. ([Source Code](https://github.com/erudika/para)) `Apache-2.0``Java`
- [Postwoman](https://postwoman.io) - A free, fast and beautiful API request builder. ([Demo](https://postwoman.io), [Source Code](https://github.com/liyasthomas/postwoman)) `MIT``Nodejs/Vue/Nuxt`
- [Tyk](https://tyk.io) - Fast and scalable open source API Gateway. Out of the box, Tyk offers an API Management Platform with an API Gateway, API Analytics, Developer Portal and API Management Dashboard. ([Source Code](https://github.com/TykTechnologies/tyk)) `MPL-2.0``Go`