Best Open Source Alternatives to API Hub (formerly SwaggerHub)

Kong is an open-source API management software that will help you create new business scopes, new revenue streams and generate traffic by expanding partner network. If you run an enormous number of APIs and need dedicated 24/7 support, then this software is apt for you. The software is embedded in Nginx and it provides a powerful proxying performance. The tool has boosted the API gateway with necessary functionalities for multiple uses. The software plugin system is open and it is possible to write your own custom plugins. Its high customization feature will give you complete control over the architecture.

KrakenD is a high-performance open-source API gateway that provides a single interface. Its stateless design provides genuine linear scalability. Also, it is a single API that reduces the fuss of dealing with different microservices. By merging microservices, it delivers a better user response and improves response time. Also, developers can save time as multiple calls can be combined into one, responses can be shrunk, and data can be transformed and transported securely. The most potent capability that stands out is its ability to automatically merge data defined by users in every endpoint as necessary. How the data is merged can also be controlled by the user. Additionally, one does not have to know coding to use the software. All data transformations, merging, picking, and definitions are declared in one configuration file. So, the API gateway behavior can be edited either manually or by utilizing KrakenDesigner.

Ambassador Edge Stack is a three-in-one edge stack for Kubernetes that delivers Edge-as-a-Service to software developers. The software packs three modules, namely API Gateway, Delivery Acceleration, and Delivery Gateway. The API Gateway brings the ability to connect Kubernetes to the internet. Alongside, it also provides an authentication function, tools for traffic management, and service mesh integration option. This also empowers the developer team to facilitate self-servicing for making changes to routine. The Delivery Acceleration, on the other hand, facilitates and supports local development of microservices via a high-level traffic routine system. Such a robust platform reduces friction in the workflow. There is a service preview feature that enables developers to test changes locally without hampering the work of other team members or collaborators. With the Delivery Portal tool, admins can expose APIs to application developers as well as public API access in order to boost product making speed. The application portal is also completely customizable and discovers all services automatically that are stored in the Ambassador Edge Stack database.

Gloo is a cloud software based on envoy proxy to connect and secure traffic across applications. It allows modernization to scale operations with an attractive control plane for distribution across different platforms. It is secure as it is based on cloud offering lightning-fast speed and high throughput with low latency. Sharing information is simple as it is equipped with an intuitive dashboard and scaling is provided instantly with its stateless architecture. It is fully featured with API gateway and Kubernetes Ingress Controller for handling a wide range of workload. It configures the Envoy Proxy to suit traffic as per the needs of users. It runs on any platform like AWS, Azure, Google Cloud and Kubernetes, connects microservices and is equipped to function Azure as well as Google Cloud. Service and security mesh integrations are provided by the software’s inbuilt resources. Other features of the software include HTTP routing, auto service discovery, connecting all workload types, configuration validation, request or response transformation and handle serverless functions.

AISIX AI Gateway is API7.ai’s Rust-native gateway for LLM and AI-agent traffic. The Apache-2.0 open-source gateway runs as a standalone data plane in the customer’s infrastructure and provides an OpenAI-compatible API, model aliases, provider credential isolation, routing and failover, access control, rate limits, caching, guardrails, and observability. Teams can run the gateway independently or optionally use AISIX Cloud, API7.ai’s commercial control plane, for centralized gateway configuration, organizations and roles, managed credential lifecycles, request logs, usage and cost visibility, budgets, and audit history. Live AI requests travel directly through AISIX gateways and do not pass through the control plane. The open-source gateway can be self-hosted for free. AISIX Cloud adds managed Developer, Team, and Enterprise options for organizations that need shared administration and governance across environments. Customers connect their own model-provider accounts and pay providers directly; AISIX is an AI gateway rather than an LLM relay or token reseller. Feature availability, support, deployment, and service levels depend on the selected AISIX Cloud plan.