If you package e-books in the EPUB format, one of the handiest editing tools available is Sigil. The growing interest in mobile apps and e-reader devices such as Amazon’s Kindle and Barnes and Noble’s Nook is fueling the e-book business for both reading consumers and authors. Without a dedicated editing tool such as the Sigil E-Book Editor, setting up the embedded HTML coding and editing an e-book manuscript is often fraught with frustration and formatting errors. 
