OpenZiti is developed and maintained by NetFoundry (
https://netfoundry.io/). We provide a productised version which is very easy to deploy, manage, operate, and monitor with high SLAs, support, legal/compliance, liability, security, updates, feature requests etc.
We are not rolling our own crypto, we use well vetted open source standards/implementations - https://openziti.io/docs/learn/core-concepts/security/connec.... If you don't trust that, you can easily roll your own - https://github.com/openziti/tlsuv/blob/main/README.md. I know people who do that. Yes, its been audited, and run my many large enterprises in security conscious use cases - e.g., 8 of the 10 largest banks, some of the largest defence contractors, leaders in ICS/OT automation as well as grid etc.
Yes, we support K8S in a lot of ways, both for tunnelling and deployement - https://openziti.io/docs/reference/tunnelers/kubernetes/. There are more native options being worked on incl. Admission Controller and Ingress Controller but I honestly don't know the exact status of either. If they interest you, feel free to ping me on philip.griffiths@netfoundry.io. I can get more info.