Sigil 1.2.0

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!

New Features (since the 1.1.0 release):

Provide a tweak setting to adjust drag distance for Windows & Linux
Added YesToAll and NoToAll options for replacing images via Add Existing...
Highdpi and uifont setting information is now available to Sigil's plugins
Add a Checkpoint feature to Sigil for fast versioned saves to git repositories
add ability to easily create a Checkpoint (stored via a local git repository)
add ability to see the changes between the current epub and any earlier Checkpoint
add ability to revert the entire epub back to an earlier Checkpoint
added ability to manage and delete Checkpoint repositories.

Bug Fixes (since the 1.1.0 release):

Fix cosmetic file name issue when aborts file rename edits in BookBrowser
Improve default drag-distance for BookBrowser for Windows & Linux
Reduce required drag distance for macOS
Fix index generation bug related to non-escaped text used in regular expressions
Fix bug that caused lost class attributes when marking words for an index
Guide to Landmark Semantic mappings have been extended to better cover "other.*" guide items
Changed the removeDir() routine to better deal with Windows delete file issues.
Updated Building on Windows docs
Updated Building on MacOS docs
Modified the codebase to use Ordered hashes/dictionaries throughout to prevent unneeded reordering in tag attribute order