Orangescrum is a free and open-source time tracking and project management software. It offers automated timers, manual time entry, timesheet management, reporting, analytics, and extensive integration options for teams.

PhpReport is a web-based time tracking application tailored for teams and companies, offering statistics on users and projects, and integration with external applications.

Redmine is a project management and issue tracking software that includes a built-in time tracking feature. It allows users to track time spent on projects and issues, categorize time entries by activity, and supports multiple tracking methods such as built-in tracker, plugins, and commit messages. Its time tracking capabilities help teams accurately calculate billable hours and monitor productivity.

Time tracking tool integrated with project management platforms like Asana, Trello, Jira, and Basecamp. Offers in-app time tracking buttons, budgeting features, and detailed reporting for teams and freelancers managing multiple projects.

Open-source browser extension that adds a Toggl Track time tracking button to various web tools and services, allowing users to start and stop timers directly from their workflow.

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.