Sigil is a free, open source, multi-platform ebook editor. it is designed to edit books in epub format.

features:

* full utf-16 support;
* full epub 2 spec support;
* multiple views: book view, code view and preview view;
* wysiwyg editing in book view;
* complete control over directly editing epub syntax in code view;
* table of contents generator with multi-level heading support;
* metadata editor with full support for all possible metadata entries (more
than 200) with full descriptions for each;
* user interface translated into many languages;
* spell checking with default and user configurable dictionaries;
* full regular expression (pcre) support for find & replace;
* supports import of epub and html files, images, and style sheets;
* files can be validated for epub compliance with the flightcrew validator;
* html tidy: all imported files have their formatting corrected, and your
editing can be optionally cleaned.
this package provides the architecture-independant files.