Gloo - The Function Gateway built on top of Envoy

Gloo is a feature-rich, Kubernetes-native ingress controller, and next-generation API gateway. Gloo is exceptional in its function-level routing; its support for legacy apps, microservices and serverless; its discovery capabilities; its numerous features; and its tight integration with leading open-source projects. Gloo is uniquely designed to support hybrid applications, in which multiple technologies, architectures, protocols, and clouds can coexist.

Gloo provides a long list of API gateway features, including rate limiting, circuit breaking, retries, caching, external authentication and authorization, transformation, service-mesh integration, and security.

Gloo can route requests directly to functions, which can be a serverless function call (e.g. Lambda, Google Cloud Function, OpenFaaS function, etc.), an API call on a microservice or a legacy service (e.g. a REST API call, OpenAPI operation, XML/SOAP request etc.), or publishing to a message queue (e.g. NATS, AMQP, etc.). This unique ability is what makes Gloo the only API gateway that supports hybrid apps, as well as the only one that does not tie the user to a specific paradigm.