tmux is intended to be a modern, BSD-licensed alternative to programs such as GNU screen. Major features include:

* A powerful, consistent, well-documented and easily scriptable command interface. * A window may be split horizontally and vertically into panes. * Panes can be freely moved and resized, or arranged into one of four preset layouts. * Support for UTF-8 and 256-colour terminals. * Copy and paste with multiple buffers. * Interactive menus to select windows, sessions or clients. * Change the current window by searching for text in the target. * Terminal locking, manually or after a timeout. * A clean, easily extended, BSD-licensed codebase, under active development.