piko
An open-source alternative to Ngrok, designed to serve production
...This design is useful for services that are private, behind NAT, firewalled, or otherwise not publicly routable. Piko is built for production-oriented hosting rather than only short-lived development demos. It supports a server and agent model, with the agent running near the upstream service and forwarding traffic from named endpoints to local ports. The project also includes Kubernetes-oriented deployment guidance, clustering behavior, and a single binary that can run in both server and agent modes.