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Sigil is a multi-platform WYSIWYG ebook editor. It is designed to edit books in ePub format.

New Features:

allow plugins to supply their own icon (plugin.png 48x48) for use on the Quick Launch Toolbar icons
extend plugin interface to include the status of the epub inside Sigil (modified or saved)
extend plugin interface to include the path to the saved epub file or the null string if never saved
extend Insert->Special Characters to include both a Greek letter panel and a mathematical symbol panel
add support for calibre:series and calibre:series_index to Metadata Editor for epub2
add support for calibre:title_sort to Metadata Editor for epub2
add support for clicking internal links in Preview to load the proper destination tab
add support for loading Qt's base translation files if present. Allows buttons on native qt dialogs to
be translated (Windows users may need to manually copy newer qtbase_xx.qm files to Sigil's translation
directory if they didn't exist in Qt5.6.2)
allow user to add custom css rules to Preview/Book View by creating a file called "custom_preview_style.css"
in the Sigil preferences folder (not responsible for custom css and ebook css fighting with each other)

Now what does it have to offer...

Free and open source software under GPLv3
Multi-platform: runs on Windows, Linux and Mac
Full Unicode support: everything you see in Sigil is in UTF-16
Full EPUB spec support
WYSIWYG editing
Multiple Views: Book View, Code View and Split View
Metadata editor with full support for all possible metadata entries (more than 200) with full descriptions for each
Table Of Contents editor
Multi-level TOC support
Book View fully supports the display of any XHTML document possible under the OPS spec
SVG support
Basic XPGT support
Advanced automatic conversion of all imported documents to Unicode
Currently imports TXT, HTML and EPUB files; more will be added with time
Embedded HTML Tidy; all imported documents are thoroughly cleaned; changing views cleans the document so no matter how much you screw up your code, it will fix it (usually)
An actually usable user interface
Native C++ application
Bugs :)
And a lot more...