What are some alternatives?
Joomag - Joomag is the all-in-one platform empowering businesses large and small to create, distribute, track, and monetize their interactive content.
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
Calameo - Publishing platform for digital magazines, interactive publications and online catalogs. Convert documents to beautiful publications and share them worldwide
Yumpu - Yumpu - Publishing digital magazines worldwide
Project Gutenberg - Project Gutenberg offers free ebooks to download.
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...