[chme]

Can this be used similar to tmate (https://github.com/tmate-io/tmate) to easily share a shell?

Why I asked for this is because tmate isn't really that secure. You have to trust the relay server.

Maybe tunshell can be combined with tmux directly to open a shared view.

[iforgotpassword]

We use tmate for support and have it configured with our own relay. If you use it just for one-offs this is probably too much hassle though.