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.
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FeedForAll Mac 

Create, edit, publish rss feeds, podcasts for iTunes. New RSS feeds and podcasts can be quickly edited or created with FeedForAll Mac. Advanced support includes name space extensions allowing users to make iTunes, Yahoo and Microsoft compatible feeds
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FeedForAll 

Easily create, edit and publish rss feeds and podcasts. New RSS feeds and podcasts can be quickly and easily created with FeedForAll. Advanced features enable you to create professional looking rss feeds and podcasts quickly and easily.
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