RSSamantha is a command line rss/atom feed aggregator/creator written in java. It is designed to subscribe to a batch of feeds in order to merge their items into new feeds and write them as rss 2.0 and/or plain text to harddisk.
Additionally it has the ability to download contents of podcastfeeds, filter feed attributes by regular expressions, preprocess the configurationfile for rather unhandy searchterms, requesting channels via HTTP GET and add/remove items from external processes via http POST.