Hours is a time tracking app that enables freelancers and consultants to track time by client or project. While it lacks built-in invoicing features, it provides an easy way to monitor work hours for accurate reporting.

Rachota is a portable and easy-to-use personal time tracking application for Windows, Linux, Solaris, and Mac, offering tools for tracking work on projects, generating reports, and increasing efficiency.

Timenotes is a lightweight time tracking tool focused on simplicity, timesheets, and basic reporting for teams and freelancers. With GitHub integration, it lets developers record time against issues and development tasks without leaving GitHub, making it easier to maintain accurate logs for projects and invoicing.

Fanurio is a cross-platform time tracking, invoicing, and billing software suitable for freelancers and small businesses looking for detailed time and expense management.

ActivityWatch is a free and open-source automated time tracker focused on privacy and extensibility. It supports cross-platform tracking, custom plugins, browser extensions, and provides detailed reports to help users analyze their time usage.

AND.CO is a time tracking app tailored for freelancers. It offers features such as contract creation and simplified reporting, streamlining time management and client invoicing for independent workers.