byobu is described as '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' and is an app in the OS & Utilities category. There are six alternatives to byobu for Linux, Mac, BSD, Cygwin and Xfce. The best alternative is tmux, which is both free and Open Source. Other great apps like byobu are GNU Screen (Free, Open Source), Wemux (Free, Open Source), mtm (Free, Open Source) and abduco (Free, Open Source).
tmux is a terminal multiplexer: it enables a number of terminals (or windows), each running a separate program, to be created, accessed, and controlled from a single screen. tmux may be detached from a screen and continue running in the background, then later reattached.
Screen is a full-screen window manager that multiplexes a physical terminal between several processes, typically interactive shells. Each virtual terminal provides the functions of the DEC VT100 terminal and, in addition, several control functions from the ANSI X3.
mtm is the Micro Terminal Multiplexer, a terminal multiplexer. It has four major features/princples: Simplicity There are three commands (change focus, split, close). There are no modes, no dozens of commands, no crazy feature list.
abduco provides session management i.e. it allows programs to be run independently from their controlling terminal. That is programs can be detached - run in the background - and then later reattached.
Zellij is a terminal workspace. It has the base functionality of a terminal multiplexer (similar to tmux or screen) but includes many built-in features that would allow users to extend it and create their own personalized environment.