Pdf Readers, including: Ghostscript, Evince, Xpdf, Kpdf, Poppler (software), Sumatra Pdf, Skim (software), Okular, Adobe Acrobat, Preview (software), ... Editions, Pdf-xchange Viewer, Stdu Viewer

Hephaestus Books represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Hephaestus Books continues to increase in scope and dimension, more licensed and public domain content is being added. We believe books such as this represent a new and exciting lexicon in the sharing of human knowledge. This particular book contains chapters focused on PDF readers, and Free PDF readers.