OpenProject is a comprehensive open-source time tracking software designed for teams and organizations. It offers features such as time tracking, budgeting, detailed reporting, and integrations with popular tools, making it ideal for project-based time management.

solidtime is a modern open-source time tracking application designed for freelancers and agencies. It features project, task, and client management, billable rates, multi-organization support, and data import from other tracking apps. It offers self-hosting and is licensed under AGPL-3.0.

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.

ActiveCollab is a project management tool with built-in time tracking, allowing detailed monitoring of hours by project, client, and task. It supports timesheet management, reporting, budgeting, and resource tracking, aiding in comprehensive work time analysis.

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.

Easy Projects is a project management platform with built-in time tracking capabilities, enabling teams to track resources, timelines, and progress. It is ideal for organizations that need integrated time and project tracking.