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What are some alternatives?
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
FBReader - FBReader is an e-book reader for various platforms. Features:
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
calibre - Ebook manager, viewer & converter
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.