A command-line, open source time tracking tool for Linux, focused on fast and efficient time logging. Exports data in JSON format. Licensed under MIT.

Bartib is a command-line time tracking tool that logs activities in plaintext files and provides flexible reporting options, making it suitable for straightforward personal time tracking.

Doug is a command-line time tracking utility that helps users track their work hours and tasks efficiently from the terminal. Suitable for developers and users who prefer CLI-based time management tools.

gtm (Git Task Manager) is a tool for tracking tasks and time directly through git, suitable for developers seeking integrated time management.

Ultimate Time Tracker (utt) is a simple Python-based command-line application for tracking time, designed for users seeking straightforward time logging.

An extension for Timewarrior that generates invoices in LaTeX format based on tracked time data.