Katana Nano is described as 'Ad, Pop-up, and Paywall busting news reader for Mac, Windows and Linux. Katana is designed to make it easier than ever before to stay up to date with what is happening in the world' and is a RSS Reader in the News & Books category. There are more than 100 alternatives to Katana Nano for a variety of platforms, including Online / Web-based, Android, Windows, Mac and iPhone. The best alternative is Feedly, which is free. Other great apps like Katana Nano are Inoreader (Freemium), QuiteRSS (Free, Open Source), Tiny Tiny RSS (Free, Open Source) and Flipboard (Free).
Feedly is a better way to organize, read and share the content of your favorite sites. It weaves the content from the RSS feeds of your favorite websites into a fun magazine-like experience and provides seamless integration with social networks.
Discover, share and read the best on the web. With Inoreader, content comes to you, the minute it's available. Subscribe to RSS Feeds, Blogs, Podcasts, Twitter searches, Facebook pages, even Email Newsletters! Get unfiltered news feeds or filter them to your liking.
Tiny Tiny RSS is an open source web-based news feed (RSS/Atom) reader and aggregator, designed to allow you to read news from any location, while feeling as close to a real desktop application as possible.
NewsBlur is a personal news reader that brings people together to talk about the world. It shows you the original site and allows you to read stories directly off the site while keeping track of what you read. It also filters and highlights stories you like and dislike.
FreshRSS is a free, self-hosted RSS aggregator. It is quite lightweight, fast (it can manage +100k articles without complaining) and powerful (e.g. shortcuts, filters, responsive design, multi-views, multi-themes, multi-users, statistics, provides a Google Reader API, etc.)