Martin "eto" Misuth:
- rxvt-unicode - uberterminal - this thing can operate [...] daemon, when single process hosts all your terminals - benefits are [...]
Drawbacks are that it doesn't understand receiving the listening socket as an already-open file descriptor, and by default it places the socket in $HOME/.urxvt/ rather than in /run/user/$USER/urxvt/ .
Martin "eto" Misuth:
- mpd - the music player daemon
This can accept listening sockets passed to it. I've added to the nosh bundles package a service bundle for it as a system-wide instance, and generators in the configuration import subsystem for per-user instances. You'll see these in version 1.30.