Sigil is a multi-platform EPUB ebook editor (think Word or LibreOffice
but specific for EPUB ebooks) with the following features:
* Free and open source software under GPLv3
* Multi-platform: runs on Windows, Mac, and Linux (note Linux only
receives limited support)
* Full UTF-16 support
* EPUB 2 spec support with limited EPUB 3 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
* 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,
* Documents can be validated for EPUB compliance with the integrated
* All imported files have their formatting corrected, and your editing
can be optionally cleaned
* Plugins!