What are some alternatives?
When comparing iCalamus and Yumpu.com, you can also consider the following products
Zmags - Zmags provides solutions create and publish web experiences instantly.
FlippingBook - Make professional mobile-ready flip book from any document. Get trusted solution and impress your audience with quality digital publishing.
Adobe FrameMaker - A desktop publishing (DTP) and word processing application that is popular for large documents.
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
Scribus - Scribus is a desktop publishing (DTP) application.