> It is also a major strike against Easybook that its PDF export functionality comes from a proprietary library. There are certainly free software alternatives
I looked for FLOSS software that converts HTML to PDF back when I was developing a web application that needed to generate some PDFs. However, I didn't find anything that satisfied my needs. I didn't have very special requirements, just not-too-buggy CSS support, a possibility to insert or prevent a page break at a specific location, vector graphics inclusion (for the company logo), a possibility to integrate it into Rails, and that the tool doesn't depend on X11. In the end I settled on using prawn instead of generating from HTML, despite the fact that it is a nightmare for complex layouts.