Open Source Vienna Alternatives
Vienna is described as 'RSS and Atom newsreader, packed with powerful features that help you make sense of the blogs and news'. There are more than 100 alternatives to Vienna for various platforms. The best alternative is QuiteRSS, which is both free and Open Source. Other great apps like Vienna are Tiny Tiny RSS (Free, Open Source), NewsBlur (Freemium, Open Source), Liferea (Free, Open Source) and Feedbin (Paid, Open Source).