E-Book Viewer (was E-Book Preview) is a top e-book renderer for your Mac. It is very lightweight because it has no heavy library collection-management features, and works exactly like Preview app for e-books. It loads very large books almost instantly!

Features

• Very lightweight in terms of memory and CPU consumption
  
• Amazing realistic page flipping animation
  
• Bookmarks, Annotations and Highlights with Export feature
  
• Customizing just everything with your books: fonts, sizes, colors, backgrounds, margins, inter-row spacing, and more
  
• Outstanding full-screen mode
  
• Supports inline videos and interactive content
  
• Speaking support for visual impared users
  
• Printing and converting to PDF
  
• Supported e-book formats: EPUB2, EPUB3, FB2, RTF/RTFD, Microsoft Office DOC, HTML, webarchive, TXT
  
• Please note: E-Book Preview doesn't support DRM-protected books due to legal restriction.
  

Version 5.1:

• Now you can export notes in different formats: HTML, RTF, and plain text
  
• Bug fixes