Scida is described as 'e-book library management app that helps you organize your mobi/prc/azw e-books on your Mac and copy them to your Kindle. The following Kindle devices are supported: Kindle Keyboard (Kindle 3), Kindle 4, Kindle Touch, Kindle black (2012), Kindle Paperwhite' and is an app in the News & Books category. There are seven alternatives to Scida for a variety of platforms, including Windows, Mac, iPhone, iPad and Android Tablet. The best alternative is calibre, which is both free and Open Source. Other great apps like Scida are Amazon Kindle (Free), Adobe Digital Editions (Free), Alfa eBooks Manager (Freemium) and Bluefire (Free).
Calibre is a free and open source e-book library management application made by users, for users. Many languages, designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.
Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and Android-based device. You can discover and read over 630,000 books in the Kindle Store, including the latest bestsellers and new releases.
One eBook reader for all your Adobe DRM protected books across your iPad, Mac or PC. Adobe Digital Editions (ADE) is free-to-download and use, and completely ad-free. Use it to read EPUB and PDF books, both online and offline.
Bluefire Reader is your go-to reading application for ePub and PDF content, including ebooks from most online book stores and leading libraries around the world. Bluefire Reader includes support for eBooks protected by Adobe Content Server.
Calibre2opds can generate OPDS and HTML catalogs from the metadata of the calibre e-book library manager. These catalogs can then be used both to browse your e-book library online and also to download books on demand.