including Citadel (acting as Certificate Authority), citadel agent, etc.

- [istio/proxy](https://github.com/istio/proxy). The Istio proxy contains
extensions to the [Envoy proxy](https://github.com/envoyproxy/envoy) (in the form of
Envoy filters) that support authentication, authorization, and telemetry collection.

- [istio/ztunnel](https://github.com/istio/ztunnel). The repository contains the Rust implementation of the ztunnel
component of Ambient mesh.