Flowkeeper is a desktop timer based on the Pomodoro Technique, designed to help users track focused work intervals and breaks.

Hamster is an open-source time tracking application designed for individuals to log time spent on activities throughout the day. It’s user-friendly and suitable for personal productivity tracking.

myAgilePomodoro is a free open-source desktop time-tracking application that combines the Pomodoro technique with Agile task management. It supports multi-language, portable usage, and integrates time and task tracking with reporting features.

Anuko Time Tracker is an open-source web-based application designed for tracking time spent on projects and analyzing productivity, suitable for teams and managers. It allows for integration with other systems via its customizable nature.

Toggl Desktop is an open-source client for Toggl's time tracking platform, offering features such as idle detection, reminders, and a Pomodoro timer to optimize time management.

Anuko is a popular open source time tracking software that analyzes work hours for productivity and profitability, offering plugins for charts, attachments, and record locking.