WR Time Tracker is an open source, web-based work time tracking system. It is simple and very easy to use. This web application allows you to create user logins, organize them in teams, create and modify projects and activities, input work time, generate reports and invoices and send them as e-mails. The system runs on FreeBSD, Linux or Windows. Free hosting of this service is available for public at http://timetracker.wrconsulting.com. The system is available in 5 languages: English, French, Norwegian, Portuguese, and Russian.