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Wikipedia (RSS, ATOM, Syndikation, etc.)

RSS – Wikipedia
Atom (Format) – Wikipedia
Content-Syndication – Wikipedia
Outline Processor Markup Language – Wikipedia
Extensible Markup Language – Wikipedia
Aggregator – Wikipedia
Feedreader – Wikipedia
RSS-Editor – Wikipedia
Liferea – Wikipedia
Planet (Software) – Wikipedia

RSS Software (Standalone-Clients)

Newsbeuter
Liferea
Liferea, a simple and free Linux desktop news aggregator with support for TheOldReader and TinyTinyRSS
Snownews
Akregator – KDE UserBase Wiki
TICKR - Open Source FEED READER
Tickr-0.6.4 - A Free Open Source Feed Reader for Linux and Windows

Feedreader (Webbasiert)

WikiStart - Tiny Tiny RSS
Redmine
selfoss - the open source web based rss reader and multi source mashup aggregator
selfoss the web based open source rss reader and multi source mashup aggregator
Planet Feed Reader
moonmoon: simple web based feed aggregator in PHP
Google Reader – Wikipedia

Feed-Services

Bloglines
Bloglines is the fastest way to find, track and vote on your favorite websites and blogs in real-time. Get the latest news on all your interests and trending topics exactly the way you want it, with the new Bloglines Reader! Now, with BlogLines Local, find and vote on hyper-local content from top blogs and websites in all of your favorite cities.
Über uns: netzeitung.de mit neuen Inhalten - netzeitung.de
Sonstiges - netzeitung.de ist ein automatisiertes Newsportal, das dem Leser die wichtigsten Nachrichten des Tages präsentiert. Dabei werden Meldungen von hunderten von journalistischen Quellen ausgewertet. Außerdem bietet netzeitung.de eine Suche in rund 1.500 Nachrichtenquellen an, im netzeitung.de Archiv sowie in Blogs, Twitter und Wikipedia.
FeedAgg.com | The Best Blogs and RSS Feeds on the Web | RSS Directory
Find the best Blogs and Feeds on the net with FeedAgg.com.
Google News – Wikipedia

RSS/ATOM - Specifications, rfcs, stuff

RSS 2.0 Specification (version 2.0.11)
Version 2.0.11 of the RSS 2.0 specification, published on March 30, 2009.
W3C Feed Validation Service (ATOM & RSS)
Atom Enabled
RSS Specifications
RSS specifications, the history of specifications and the evolution of RSS as industry standard.
Feed Validator & Documentation
https://www.ietf.org/rfc/rfc5005.txt

Planets

Planet Jabber
News aggregator | LinuxChix
Planet - Fellowship of FSFE
Planet Twisted

RSS-Quellen

Gmane -- Mail To News And Back Again
John Sullivan (johns) – http://status.fsf.org
Executive Director
Richard Stallman Political Notes - Identi.ca
Free Software Foundation - Identi.ca

Galaxy ()

The internet is our social network | friendica
Resource Description Framework – Wikipedia