Just released this plugin to integrate external feeds on a Kirby site.
The FeedReader plugin provides an unified access to the elements of a feed. A feed might be of type RSS, Atom or JSON and is accessed by its URL. A snippet and a blocks blueprint are provided as a starting point.
After installation, with
use Adspectus\FeedReader\FeedReader;
$feed = new FeedReader('https://www.heise.de/security/rss/news.rdf');
the content of the feed is accessible through various methods of the instance of the FeedReader object which is now stored in the $feed variable.
See this Github repository for more details.
Feedback welcome!