tmux is a terminal multiplexer. It lets you switch easily between several
programs in one terminal, detach them (they keep running in the background) and
reattach them to a different terminal.
Download tmux 3.3a here
(changes in this version).
the getting started guide;
how to install tmux;
the tmux(1) manual page;
and the README.
the email@example.com mailing list.
Some notes on tmux development and ideas for contributions are here.