cmux is an open-source terminal multiplexer inspired by tmux, providing a text-based user interface (TUI) for managing multiple terminal sessions. It allows developers to split panes, manage sessions, and navigate efficiently within the terminal. The tool is designed for users who need advanced terminal management features in a CLI environment.
In the Developer Tools space, cmux takes a focused approach. It focuses on managing multiple terminal sessions efficiently within a single terminal window using a TUI multiplexer. It is built as an open-source project for developers. cmux is open source under the MIT license. The product ships for the command line.
It is developed by manaflow-ai, and the product first shipped in 2026. Development happens publicly on GitHub with 24.6k stars and 4.4k commits in the last 90 days. Key capabilities include terminal multiplexing, TUI interface, and session management.
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