Gravitee.io is described as 'flexible, lightweight and blazing-fast open source API Management solution that helps your organization control finely who, when and how users access your APIs' and is an app in the Development category. There are more than 10 alternatives to Gravitee.io for a variety of platforms, including Linux, Online / Web-based, Mac, Windows and Self-Hosted solutions. The best alternative is Tyk, which is both free and Open Source. Other great apps like Gravitee.io are KrakenD (Free, Open Source), Kong (Free, Open Source), apiman (Free, Open Source) and WSO2 API Manager (Free, Open Source).
KrakenD is an ultra performant API Gateway with middlewares or it's also known as a *Backend For Frontend* as it sits between the client (frontend) and source servers (backends) offering a custom API that provides only the information that the UI needs.
Kong is a scalable, open source API layer (also known as a API gateway, or API middleware). Kong runs in front of any RESTful API and is extended through plugins, which provide extra functionalities and services beyond the core platform.
Nevatech Sentinet is the only enterprise class API Management and SOA Governance platform written in .NET that is available for On-Premise, Cloud and Hybrid environments. It connects, mediates and manages interactions between services across the enterprise or in the cloud.
Tyk Cloud is a full-featured API management platform based around the open source Tyk API gateway, that means you get all the features of the open source version without any of the integration and implementation headaches.
3scale provides an out of the box cloud API management platform and infrastructure for developers, and companies to securely open, control, manage, operate and monetize their API to third parties (e.g. developers, business partners, etc.).