Pollen is described as 'publishing system that helps authors create beautiful and functional web-based books. Pollen includes tools for writing, designing, programming, testing, and publishing' and is an app in the Photos & Graphics category. There are six alternatives to Pollen for Linux, Mac, Windows and BSD. The best alternative is LaTeX, which is both free and Open Source. Other great apps like Pollen are DocBook (Free, Open Source), ConTeXt (Typesetting System) (Free, Open Source), Text::Amuse (Free, Open Source) and Groff (Free, Open Source).
LaTeX is a document markup language and document preparation system for the TeX typesetting program. The term LaTeX refers only to the language in which documents are written, not to the editor used to write those documents. In order to create a document in LaTeX, a .
“a system for typesetting documents based on TEX and METAPOST. You can use this system for converting documents coded in TEX format as well as documents coded in XML into high quality PDF” (http://www.pragma-ade.