Web service RSS feed
The Web service RSS feed web part can be used to create an RSS feed of data provided by an external web service. It uses a built-in web service data source as a source of the feed data. It displays a link leading to the feed, which is located at the URL of the page where the web part is placed, with a querystring parameter appended.
The web part belongs to the Syndication module. Full documentation of the module can be found in Kentico CMS Developer's Guide -> Modules -> Syndication.