Tine 2.0 is an open-source business software suite with integrated time tracking, project management, and CRM features. It is licensed under the AGPL-3.0 license.

Titra is a self-hosted, open-source time tracking and project management tool for freelancers and small teams. It enables users to track time, manage projects and tasks, and generate detailed reports and graphs.

django-timepiece is a multi-user, open source application for tracking employee time on projects. It provides features such as time sheets, project and business management, dashboards, payroll reporting, and invoicing, making it directly relevant for time tracking needs.

Easy Redmine is an open-source project management and time-tracking tool that extends Redmine, supporting Agile and Waterfall methodologies, risk/resource management, and integration with various platforms. It is suitable for teams seeking customizable and scalable time-tracking solutions.

aitrack.work is a minimal, open-source self-hosted task-based time tracker for everyday use, enabling users to organize and monitor time spent on tasks.

Cattr is an open-source time tracking tool designed to monitor employee productivity through features like screenshot capture, automatic activity detection, and customizable extensions. It supports on-premises deployment for secure data storage and transparency, making it highly relevant for teams needing robust time tracking solutions.