The best open source alternative to Google Reader is QuiteRSS. If that doesn't suit you, our users have ranked more than 100 alternatives to Google Reader and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Google Reader are NewsBlur, FreshRSS, CommaFeed and RSS Guard.
BlogBridge is an open source Java-based feed aggregator.
BlogBridge is aimed for those people who are subscribed to many feeds, including journalists, PR professionals and OPML enthusiasts.
BlogBridge also gives users the option to create an account with the free "BlogBr.
KrISS feed is a simple and smart (or stupid) feed reader. To see an online example: http://tontof.net/feed Feel free to contribute: https://github.com/tontof/kriss_feed.
RSS Bandit is a standalone reader that has many attractive features, allowing a user to merge news headlines from multiple sources onto a single page, and organize articles based on keyword, read/unread status, and date.
Feed On Feeds is a server-based RSS aggregator written in PHP. It provides a simple firehose-style interface with the capability of filtering on tags and individual sites.
Sputnik is a simple and practical rss reader for Windows and Mac OS X.
Pros:
Snackr was built using Adobe Flex 3 and Adobe AIR 1.0. It's an RSS ticker that pulls random items from your feeds and scrolls them across your desktop. When you see a title that looks interesting, you can click on it to pop up the item in a window.
NewsFox is an efficient 3-pane(email) style Atom/RSS feed reader. NewsFox allows you to group your feeds as you wish, read feed content offline, update feeds when you want, 1-click subscribe with the Firefox URL bar icon, and read other feeds while updating.
birdreader - Home-made, Open-source Google Reader replacement powered by Node.js and CouchDB (Cloudant).
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