Add any RSS feed URL to this Custom Dynamic Source and use its content in your Dynamic Builder setup. In example you can add a external news websites feed in a builder Grid element or perhaps get a Podbean.com feed in a nice List element. Or you can perhaps integrate a medium.com publication (example rss feed: https://medium.com/feed/@Medium). Most services today do have a RSS feed option like SoundCloud.com, Medium.com, Prezly.com, Podbean.com etc. Your imagination is the limit!