Okular is a universal document viewer developed by KDE. Okular works on multiple platforms, including but not limited to Linux, Windows, Mac OS X, *BSD, etc.

Features:

• Supported Formats: PDF, PS, Tiff, DjVu, Images, DVI, XPS, Fiction Book, Comic Book, Plucker, EPub, Fax
• Sidebar with contents, thumbnails, reviews and bookmarks
• Annotations support