This is the RCPApps.org update site. You can download the plugins individually, or you can configure Eclipse to find them for you automatically. To do so, add the following as an update site:
http://www.rcpapps.org/update/
To do this, select the Help -> Software Updates -> Find and install, and then
select the Find new features to install. Add a New remote site with
the above URL and name RCPApps.org. After clicking Finish, you should
be able to see the features and plugins available.
You only need to install the RCPNews feature from the update site; any other required
plugins and features will be computed automatically. After downloading the feature, you may
need to restart Eclipse. You will then be able to view the RCP News perspective.