AmphetaDesk is a free, cross platform, open-sourced, syndicated news aggregator - it obediently sits on your desktop, downloads the latest news that interests you, and displays them in a quick and easy to use (and customizable!) webpage.
"This page takes any Atom feed and converts it to the RSS 2.0 format. Blogspot users should find this useful since Blogger does not provide free support for RSS. Your best option, however, is to find a newsreader that supports Atom."
BottomFeeder is a news aggregator client (RSS and Atom) written in VisualWorks Smalltalk. BottomFeeder runs on Linux x86, (also FreeBSD), PowerPC Linux, Sparc Linux, Windows (98/ME/NT/2000/XP/CE 4), Mac OS8/9, Mac OS X (PPC, intel), AIX, SGI Irix, HP-UX,