- Free and open source software under GPLv3
- Multi-platform: runs on Windows, Linux and Mac
- Full Unicode support: everything you see in Sigil is in UTF-16
- Full EPUB spec support
- WYSIWYG editing
- Multiple Views: Book View, Code View and Split View
- Metadata editor with full support for all possible metadata entries (more than 200) with full descriptions for each
- Table Of Contents editor
- Multi-level TOC support
- Book more...
- Use numeric entity for non-breaking spaces (nbsp) instead of named entity.
- Fixes issues where files without a doctype won't open properly.
- OS X 10.6 or later