Sigil 1.4.3

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 1.4.3 fixes:

critical bug fix for OPF metadata attributes that use named entities
fix bug in "Add Existing" files when file names would require percent encoding
fix bug in multiple language spellchecking dialog word lookup when no language attributes used
update de, nl, sv, ko, ru translations that missed the Sigil 1.4.0 initial release
critical bug fix for over xml encoding html used inside metadata in the opf
revert ctrl-f to it long standing Find and Replace behaviour
fix mismatched override wait cursor usage
fix crashes when dictionaries are missing on load or during first spellcheck
update the mapping of language codes to dictionaries without the need to restart
fix critical bug which caused split to break links that are bare fragments
fix additional critical bugs which caused split to lose fragments from link targets
fix double # chars in fragment ids during merge
fix hang on load with bad encryption.xml font uris
quiet unneeded debug output when importing an epub
fix opf cleanup bug when identical xmlns values are used with two different prefixes on the same tag