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I am searching for free event sources that I can use within my java-application. I am looking for something similar to YahooFinance, where one can query a bunch of stock info and retrieve the result as csv.

Ideally, an API or a URL with some query string would be perfect.

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user445218
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How about SuperFeedr?

You could also run some SPARQL-query on some SPARQL-Endpoint and "feed" the result back to your application. Here is a list of some endpoints (here including uptime and availability stats).

Twitter also offers an Streaming-API, where one can listen for status changes etc.

Another way could be to implement some HTML-crawler that extracts interesting facts from webpages, but that's probably not what you are looking for...

Kind of related:
 Flickr API - observe activities on flickr
SO - Cricket API

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Gnark
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for this you can use Rss4j api which provide both read feed and also create you own feed.

hope this will help you

Yogesh Prajapati
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    Actually, I wouldn't recommend exactely this library. I'd suggest you give Rome a try. It is available here: http://mvnrepository.com/artifact/rome/rome – Gnark Apr 05 '12 at 12:57