When reading your RSS feeds, do you prefer a local application versus one that is online-only? If so, look no further than ShareFire. Besides being platform-independent (courtesy of Adobe Air), it is also completely free and open-source. It was created with article sharing in mind, as its name implies. According to its creators, Christian Cantrell and Dan Koestler, this was a priority.
Additional features include a keyword-based notification system (which they call Smart Topics), posts arranged by topic, a switchable viewer between RSS and live web, and support for over a dozen foreign languages! You can also easily import and export OPML files you have generated from other utilities such as Google Reader or Toluu.
We found ShareFire to be on-par with other standalone feed readers when it comes to displaying and managing feeds. However, its built-in sharing links make it a cut above most basic readers and the alert system for keywords could come in very useful. One bug we did notice is that lack of any way of deleting a Smart Topic once created, and its somewhat heavy memory usage, even with only a few feeds in the queue.
More information can be found on Adobe's Air blog here.