Ask HN: Any better alternative to Yahoo Pipe?
I need to aggregate feeds from different source and transform the data
Since you didn't indicate you'd already seen it, here's the same question twice (with some useful answers) on SO:
http://stackoverflow.com/questions/2627387/is-there-a-decent...
http://stackoverflow.com/questions/2019887/alternatives-to-y...
Personally, I think pipe2py looks interesting.
This works ok: http://open.dapper.net/developers/webservices/search.php
If you're talking straight rss feeds, its probably just easier to write it in code. But Yahoo Pipes is more a GUI tool than a coding solution, so I'm making the assumption you don't want to code this yourself. In that case, check out Dapper or Kapow! Technologies. There are others, but those are probably the best.
Checkout Feedity - http://feedity.com (shameless plug)