I've been using Herdr for a while now, but I'd like a multiplexer that's also a meta-harness that I can connect to remotely. I know others have setups that work, I just haven't quite figured it out yet.
It’s not open source, and costs a few bucks, but it works well and has live Claude/Codex/etc notifications if you are willing to install a hook daemon on your hosts with homebrew. I was looking for batteries-included “code from my iPhone” after trying a bunch of self-hosted stuff, now I connect to my Macs over Tailscale and get dropped right into multiplexer sessions with rich status notifications.
All in all, I did not find it worth it compared to using mosh or SSH in Termux. I have a colleague who loves Moshi though, for him its perfect. Among other things he likes the dictation.
I have seen moshi.app but haven't tested it yet.