Sigil 2.3.1

Sigil

Sigil is a free, open source, multi-platform ebook editor. It is designed to edit books in ePub format (both ePub 2 and ePub 3). It also provides features for advanced users, like direct XHTML, CSS and XPGT editing. You can use it to add any of the metadata entries supported by the EPUB specification and create a hierarchical Table of Contents.

Sigil key 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!

Sigil 2.3.1 changelog:

Sigil version 2.3.1 is primarily a bug-fix release. Also note that the Microsoft VC++ runtime redistributable is no longer being bundled in the Sigil Windows installer starting with version 2.3.1. This should already be installed on any Windows PC that Sigil is supported on.

Changes in this Release

Bug fixes

fix to prevent double epub load warnings
fix to prevent load warnings without details from causing a crash
fix to prevent rename templates from using characters forbidden in file names and paths
fix to better restoreState when MainWindow is Maximized of FullScreen
fix lost External Editor Preference when browse cancelled (BeckyEbook)
fix for crashes related to serious epub load exceptions
better handle epubs with missing NCX files