Byobu is a GPLv3
open source text-based window manager and terminal multiplexer. It was
originally designed to provide elegant enhancements to the otherwise
functional, plain, practical GNU Screen, for the Ubuntu
server distribution. Byobu now includes an enhanced profiles,
convenient keybindings, configuration utilities, and toggle-able system
status notifications for both the GNU Screen window manager and the more
modern Tmux terminal multiplexer, and works on most Linux, BSD, and Mac distributions.