The easiest way to get started with DRS is to use the following java webstart link.
Alternatively please access the source code from sourceforge here.
CVS read access is always available and is the best way to get an up to date version of the system, though the recent bundle (v1.1) is up to date at the time of posting
Please ensure you have all the requirements before attempting to run DRS.
Fieldwork tracker is available for download trough the itunes app store here.