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Are there open source news aggregators?

What infrastructure do news aggregators typically use to do the crawling, parsing, indexing, extracting, storing/format in database, etc.? Are there open source news aggregators so that I can learn how those problems are solved?
( 3 comments | 3 points | on HN )
Re:Are there open source news aggregators? by mschuster91 on Thursday September 26, 2013 @05:42AM (#6449721)
Hi! I'm just developing one at http://github.com/msmuenchen/skynetrss (demo instance at http://dtmp.vm-dg.de/rss/ - don't rely on this one working 100% of the time;)).

The only other FOSS project I know about is TinyTinyRSS aka TTRSS.

Re:Are there open source news aggregators? by Ahtuduck on Thursday September 26, 2013 @08:08AM (#6450147)
There are a few still active or not : Gregarius, Lilina, TinTinyRSS, RSSLounge and the more recent selfoss from the same developper. More generally you would search for new informations on the topic with something like "self hosted rss reader" in a search engine
Re:Are there open source news aggregators? by hhhhhhhhh on Thursday September 26, 2013 @08:46AM (#6450321)