Subversion is a revision control system, much like CVS. The source code for Simple Cart is maintained in a Subversion code repository from which many developers can checkout the entire code base. This one repository enables concurrent contributions from as many developers as are granted the developer role

Various clients are available to facilitate communication with Subversion, including a full command line client. Others include TortoiseSVN which integrates directly with Windows(TM) Explorer and is IDE independent. RapidSVN is another GUI that is cross platform and provides the entire user interface needed for file management and diffs.

Other clients can be full documentation can be found at the Subversion web site along with free downloads.