Kimai

Kimai is software that tracks work time and
classifies it. It tracks time and prints out a
summary (time sheet) of your activities on demand.
The reports can be yearly, monthly, daily, by
customer, by project, or by action. Its interface
is based on using a Web browser. You can install
it as a Web service or as a single-user program on
your local workstation. It is appropriate both for
multiple simultaneous users or a single user.
Kimai does not have to run to do the recording.