Sigil

Sigil is an open-source ebook editor designed for creating and editing ePub files. It offers a user-friendly interface along with powerful features for ebook authors and publishers.

Key Features

• WYSIWYG editing interface for easy text formatting
• Supports ePub 2 and ePub 3 formats
• Built-in validation for ePub standards
• Multi-language support for global usage
• Extensible with plugins for added functionality

Pros

• Completely free to use
• User-friendly interface suitable for beginners
• Active community support and resources
• No ads or hidden fees

Cons

• Limited export options compared to some paid tools
• Some advanced features may have a steep learning curve
• Occasional bugs in software updates
• Lacks built-in options for DRM protection