klog is a simple, open-source time-tracking tool that uses plain-text files for logging hours. It’s lightweight, privacy-respecting, and integrates smoothly with command-line tools, making it ideal for users who want a customizable time tracking experience.

A tool to keep a record of time dedicated to projects, suitable for tracking productivity and project time allocation.

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.

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

Chrono is a fast, Go-based time tracking tool with a simple interface, suitable for users who need efficient and straightforward time logging.