Feedn Read is a free Java based open source newsfeed reader.
EditByBSEditor: It is powered by the Sun ROME syndication framework and therefore supports all current formats (RSS 0.90, 0.91, 0.92, 0.93, 0.94, 1.00, 2.00, ATOM 0.30 and 1.00).
It disposes of an intuitive, fast and responsive user interface using Eclipse technologies, i.e. JFace and SWT. Thus it combines the platform Independent Java world on one hand with a fast native user interface on the other hand.
Features:

Since this would go beyond the scope of a short overview the list only displays the primary application features. Click to download the latest binary release. Available for Win32 and Linux systems.

Multi threaded application environment

Multi language support

Multi tab style reading

Convenient and powerful favorite management

NewsFeed retrieval and update

Newsfeed aggregation

Scheduling for automatic newsfeed retrieval

Easy news filtering

Easy favorite filtering

Automated news watches based on arbitrary keywords

Archive support to recognize already Read News

News tagging support

Newsfeed caching support

RSS enclosure support

Podcast support

System tray support including pop up Notifications

Internal web browser

OPML import/export

Customizable interface

Drag & Drop support

Etc. you can free download FEED'N READ for Linux 0.6.0b now.