gepub https://rubydoc.info/github/skoji/gepub DESCRIPTION: a generic EPUB parser/generator library. FEATURES/PROBLEMS: GEPUB::Book provides functionality to create EPUB files and parse EPUB files Handle every metadata in EPUB2/EPUB3. See issues for known problems. If you are using GEPUB::Builder and do not like its behavior (e.g., GEPUB::Builder evaluates the block as inside the Builder instance),