What are some alternatives?
When comparing iCalamus and Adobe FrameMaker, you can also consider the following products
Zmags - Zmags provides solutions create and publish web experiences instantly.
MadCap Flare - Documentation for Any Audience, Language or Format
Readymag - Readymag is a comprehensive solution that allows you to design web publication, magazines, presentations, websites, and all the other publications.
Scribus - Scribus is a desktop publishing (DTP) application.
Yumpu.com - Yumpu.
Adobe InDesign - Adobe InDesign is a desktop publishing software application.