For getting the software on this site, you need to use the Eclipse
Update Manager (choose Help > Software Updates > Find and Install
in Eclipse 3.3 or later).
Define a new remote update site named "Target Management GSoC Updates", and specify
as the URL to use. See Eclipse Help for general information about using Update Manager.
If you do not have Eclipse installed yet, better use the Eclipse Downloads first. The "Eclipse IDE for Java EE Developers" package (JEE package) comes with RSE pre-installed already. Otherwise, you'll also need to download the RSE SDK from the TM Download Site or install it from the Ganymede Update Site before you get the TM GSoC addition from here.