Many editors exist including [[calibre (software)|calibre]], [[Sigil (application)|Sigil]], [[Adobe InDesign]], [[Genebook]] and [[LaTeX]]. An [[open source]] tool called ''[https://github.com/IDPF/epubcheck'' epubcheck] exists for validating and detecting errors in the structural markup (OPS, OPF, OCF) as well as the XHTML and image files. The tool can be run from the command line, or used in [[Web application|webapps]] and applications as a [[Library (computing)|library]]. A large part of the original work on the tool was done at [[Adobe Systems]].<ref name="epubcheck">{{cite web |url=http://code.google.com/p/epubcheck/ |title=epubcheck: Validation tool for Epub |accessdate=January 29, 2010 |work=Google Code }}</ref>
Readers exist for all major hardware platforms including [[iBooks]] and [[Google Play Books]].
