Sigil is a multi-platform EPUB ebook editor. Features: Free and open source software under GPLv3 - Multi-platform: runs on Windows, Mac, and Linux - 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