Whole bunch of alternatives too - https://github.com/anderspitman/awesome-tunneling https://github.com/anderspitman/awesome-tunneling. I will advocate for zrok.

Whole bunch of alternatives too - https://github.com/anderspitman/awesome-tunneling https://github.com/anderspitman/awesome-tunneling. I will advocate for zrok.io as I work on its parent project, OpenZiti. zrok is open source and has a free SaaS with more security hardening/authN/authZ than Funnel.