WR Time Tracker is an open source, free web-based work time tracking system. It is simple and very easy to use. It allows you to create user logins and organize them in teams, create and modify projects and activities, input work time, generate reports and invoices and send them via e-mail. 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 13 languages: English, Dutch, Estonian, French, German, Hungarian, Icelandic, Norwegian, Polish, Portuguese, Romanian, Russian, and Spanish.