News aggregators take information from multiple RSS sites and provide a view of updated content. Instead of having to visit a site to see what is new, the aggregator provides an aggregate view of the new items. This is a very nice way of keeping up-to-date with sites that provide RSS.

Liferea

(nyt)

Akregator

Works well. Akregator is integrated with Kontact (click on the Feeds icon).

Items marked with (nyt) indicate I have not yet tested it. I've heard
it's good (so it has made it on the list) but have not yet tested it
myself.