From The Evince Team:
Evince is a document viewer for multiple document formats. It currently supports PDF, postscript, djvu, tiff and dvi. The goal of evince is to replace the multiple document viewers that exist on the GNOME Desktop with a single simple application. The integrated search displaying the number of results found and highlights the results on the page. When index information is included in a PDF Evince will display it in a tree format. Evince can open PDF documents that have been encrypted. It implements ATK interface, so it's accessible.