Vienna is a freeware and open source RSS/Atom newsreader with article storage and management via an SQLite database, written in Objective-C and Cocoa for the Mac OS X operating system. It provides features comparable to commercial newsreaders, but both it and the source code are free and available for download. A summary of some of its features: Subscribe to Atom/RSS news feeds and podcasts. Simple and intuitive user interface with customisable toolbar. Built-in tabbed browser. Global search of all retrieved articles. Automatic detection of newsfeeds on Web pages. Smart folders for organising related feed articles. Custom article display styles. Three separate reading layouts. Blogging integration. Support for downloading enclosures in articles Filter the displayed articles. Manual reordering of the subscription list. Full AppleScript support. Localised into several languages.