Multiplex: Command-Line Parallel Process Manager

Multiplex is a command-line tool with a simple Python API to run multiple processes in parallel and stop them all at once, or based on a condition. It gracefully shuts down child processes, multiplexing their output and error streams to stdout and stderr for easy parsing with standard command-line tools. Multiplex is useful for running multiple programs concurrently and combining their output, such as a web server, work queue, and database. It supports named processes, delayed starts, process- or time-based dependencies, and actions like silent mode and terminating other processes on completion. With its concise syntax, Multiplex simplifies complex orchestration, including CI/CD pipelines and development environment setup.