RSS Merge script 

XSLT 1.1 script which (recursively) merges several RSS 1.0 channels into one, filtering news by topics using mod_taxonomy. Also can be used to limit the number of items in an RSS file. Supports images. Build your news channels from several channels. Filter news by topic.
rss rss 1.0 weblog blog rss tools rss software xslt script xslt 1.1 script xslt template xslt 1.1 template rss reader rss 1.0 reader news syndication

Lektora 

Lektora is the FREE RSS feed aggregator that integrates seamlessly with Firefox and Internet Explorer to enable easy reading of news feeds within the web browser.
rss reader feed feeds blog blogs weblog weblogs news internet explorer firefox headline headlines