tmate is an incredible piece of software! The terminal multiplexing is surprisingly similar to the problem of collaboratively sharing terminals, and forking tmux is a really elegant way to handle that. I took a lot of inspiration from other terminal software out there
Have you considered adding a section to the readme comparing Sshx to these well-known alternatives?
I could do it!! It’s on the list
(note that sshx is pretty different from all the suggested alternatives though)
Tmate is amazing, highly recommended. It's my favorite way to do pair programming.