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BlogSieve is a free web-based tool that creates new feeds by filtering, merging and sorting existing feeds. The BlogSieve engine accepts virtually every (valid) feed format, processed results are then exported into any feed format you choose.

Mix any number of RSS feeds into one unique new feed! RSS Parsers, Widget generator

COLLECT all available statuses, posts, comments, photos, videos, bookmarks, and more from dozens of sites. MONITOR your hosted Gnip Data Collector in realtime with 100% insight into what's happening and why. MANAGE your rules to maximize data collection and minimize latency; or let Gnip's software do it for you. FOCUS on creating value with the data, leaving the collection to us.

... and doc to PDF converter

feedkiller provides an rss mix service. with our tool you can put a variety of content into your website or favorite rss aggregator with a single rss feed. 

Use jumbra to share your feeds from other sites with everyone. Instead of dealing with many feed URLs and having people subscribe to each one, you can combine them all into one. Others will see everything from your other site feeds... and best of all, you can add new feeds to your list and your combined jumbra feed will update automatically!

I mingle all your feeds into one to produce a combined RSS, Atom, JSON and a widget

Feedweaver allows you to create your own personalized RSS feeds. You can create your own feeds by combining source feeds from your favorite websites, and use filters to choose what you want in it! Combine mutiple feeds You can combine multiple RSS feeds into one. For instance, you can combine the RSS feed from cnn.com, times.com and bbc.co.uk into one RSS feed, which later on can be customized by yourself. Customize your feed Customize your combined feeds by using keyword filters. For example, you can extract all the news about "iPod" from your feeds with just one click. Share your feeds You can easily share your feeds with friends by giving them the feed's URL, and they don't need to login to view the actual feed, as all the feeds are available to everyone who knows the address. Try the demo