What are some alternatives?
Readymag - Readymag is a comprehensive solution that allows you to design web publication, magazines, presentations, websites, and all the other publications.
MadCap Flare - Documentation for Any Audience, Language or Format
SPIP - Système de Publication pour Internet
FlippingBook - Make professional mobile-ready flip book from any document. Get trusted solution and impress your audience with quality digital publishing.
Yumpu.com - Yumpu.
Visiolink - Visiolink offers digital publishing solutions for newspapers and magazines.