Vienna

Open source; $0

Current Version: 2.5.0.2501 (March 19, 2010)

Vienna is a freeware, open source RSS/Atom reader for the Mac OS X operating system. It provides features comparable to commercial newsreaders but it is both it and the source code are freely available for download. Features include:

• Simple, uncluttered UI - Vienna's user interface is intentionally kept sparse as so to only present you with the controls you absolutely need. All other functionality is moved to the menus.
• Support for RSS and Atom feeds - Vienna supports both RSS 2.0 and Atom feeds. It automatically takes care of deciphering and presenting the articles in a consistent format regardless of the original feed format.
• Smart Folders - Create folders whose contents are dynamically determined by criteria that you specify. When you view the folder, Vienna automatically displays all articles meeting that criteria.
• Folder groups - Organize your subscriptions into groups and you can even create groups within groups.
• Import and Export - Import your subscriptions from Bloglines or any other RSS reader that exports in OPML format. Similarly export your subscriptions to an OPML format file for importing elsewhere.
• Scheduled Refresh - Refresh your subscriptions automatically every 30 minutes or every 1, 2 or 6 hours.
• Flagged Articles - Flag articles of interest and view them together via the Marked Articles smart folder.
• Reading Panes - Choose your reading pane layout. Put it below the articles or to the right, whichever orientation works best for you.
• Styles - Change your style in which articles are presented from any of the built-in custom styles. Or create your own styles with a bit of knowledge of HTML and CSS.

Version 2.5.0.2501 adds/changes the following:

• User Interface refresh: Removed the grey headers, made the vertical divider easier to grab and made filtering more discoverable.
• Added support for plugins.
• Added support for search engine plugins and the ability to do web-searches from the toolbar.
• Added support for blog editor plugins.
• Added support for sharing plugins that work like bookmarklets for social websites.
• Added support for script plugins.
• Added Share With Facebook button.
• Added Share With Evernote button.
• Added Share With Twitter button with automatic URL shortening via bit.ly.
• Added user contributed "Share with Delicious" plugin to the core distribution.
• Update to the current version of Sparkle, which prevents auto-updating to a version of Vienna which will not run on the user's system.
• Fix bug where deleting a feed in Unified view mode would cause Vienna to stop working correctly.
• Fix bug where changing the article font size would crash Vienna.
• Fix bug that caused zombiefied update spinners.
• Fix bug that caused the reading position to be lost upon refresh.

See the blog for the detailed history of changes.