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BottomFeeder is a cross-platform aggregator. It is written by James Robertson, an employee of Cincom in Cincom Smalltalk, the company's dialect of SmallTalk.
Like other RSS aggregators it allows you to subscribe to websites to find new content in a push update, instead of manually checking their websites periodically with a web browser.
BottomFeeder is available for Microsoft Windows, Mac OS X, Linux (x86, PPC, SPARC), and many Unix dialects.