Self-hostable software: Terminal Multiplexer (3)

tmux is a terminal multiplexer that lets multiple terminals be created, accessed, and controlled from a single screen.

Zellij is a terminal workspace and multiplexer for developers and ops-oriented users, with layouts, floating and stacked panes, plugins, and multiplayer collaboration.

RMUX is a universal multiplexer engine for working with multiple terminal sessions and related workflows across Windows, Linux, and macOS.