Paessler Site Inspector 

Paessler Site Inspector is a web browser that combines the two most frequently used browser engines; Internet Explorer and Mozilla/Gecko into one program. Its advanced analysis features make it the perfect companion for webmasters and web developers.
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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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