[$] Sigil simplifies creating and editing EPUBs

Creating an ebook in EPUB format is easy,
for certain values of "easy". All one really needs
is a text editor, a few command-line utilities; also needed is a working
knowledge of XHTML, CSS, along with an understanding of the format's
structure and required boilerplate. Creating
a well-formatted and attractive ebook is a bit harder. However, it can be
made easier with an application custom-made for the purpose. Sigil is an EPUB editor that
provides the tooling authors and publishers may be looking for.