Envoy

Envoy is an open-source, high-performance L7 proxy: it functions as a universal data plane for cloud-native service mesh architectures.

Envoy Proxy is the C++-based, high-performance edge and service proxy originally developed at Lyft. It is purpose-built for modern microservice architectures, typically deployed as a sidecar in a service mesh (e.g., Istio). The technology operates across L3/L4 and L7, providing critical traffic management features: advanced load balancing, automatic retries, and circuit breaking. Configuration is dynamic via the xDS API, allowing updates without restarts. With first-class support for HTTP/2 and gRPC, Envoy abstracts the network, delivering deep observability and a robust communication bus for large-scale distributed systems.

https://www.envoyproxy.io/