Feedreader is a lightweight open-source aggregator that supports all major RSS/ATOM formats.

Features:

* Supports all major syndication formats: RSS 0.9, 0.91, 0.92, 1.00, 2.0 plus Dublin core and Slashback extensions
* Pre-configured with hundred of quality feeds from leading syndicators such as NewsIsFree and Moreover
* Alerts about incoming feeds on taskbar
* Caches headlines for offline viewing
* Supports proxies
* Allows one-click subscription of Radio Userland and AmphetaDesk feeds
* Search support
* Multilanguage support
* OPML import and export.