Sigil

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.