The Mentoract Reader is a free, a cross-platform package that views standards-compliant eBooks. The Reader was built from the ground up to be standards-compliant, internationalized, and accessible. Here are a few features of the Mentoract Reader:

• One of the most comprehensive implementation of the Open eBook specifications available.
• Natively reads OEB package files (.opf) and OEB document files (.html/.htm).
• Displays animated graphics using GIF89a (.gif) images.
• Supports interactive Java applets embedded directly within eBook content.
• Plays embedded audio.
• Recognizes the full Unicode code point set through its robust handling of the UTF-8 and UTF-16 encodings.
• Supports internationalized characters sets, including correct right-to-left flowing of the Arabic script.
• Automatic recognition of system installed fonts for international characters.
• One-page or two-page displays available for all books, with several pre-defined layouts.
• Books may be resized to match user preferences and specific screen size.
• Text size can be enlarged or reduced to match user viewing preferences.
• Bookmark embedding allowed.
• Full text search included.