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What is Sumatra PDF?

Evince is a document viewer for multiple document formats. It currently supports pdf, postscript, djvu, tiff, dvi, cbr, cbz, etc.

Okular is a universal document viewer based on KPDF for KDE 4 with support for advanced document features, such as annotations, forms, and embedded files.

MuPDF is a lightweight PDF and XPS viewer.

Are you tired from many viewers one for each document?Do you want to have, one program for all your technical documentations, scientific books and so on?Do you want to have program, which fast opens files, fast loads pages and fast renders page to screen?And all of this in free software?

qpdfview is a Qt-based tabbed document viewer using the Poppler library for PDF rendering and CUPS for printing. Support for the DjVu and PostScript formats can be added via plugins.

EBookDroid is an open source (GPL'ed) document viewer for Android based on the VuDroid code base.

A fork of the last GPL version of EBookDroid. Supports the following formats:

With Google Docs Viewer, you can quickly view many file types online, including PDFs, Microsoft Office files, and many image file types.

Open Source PDF Viewer for Android based on MuPDF library

Atril is a simple multi-page document viewer. It can display and print PostScript (PS), Encapsulated PostScript (EPS), DJVU, DVI, XPS and Portable Document Format (PDF) files. When supported by the document, it also allows searching for text, copying text to the clipboard, hypertext navigation, and table-of-contents bookmarks. Atril is a fork of Evince.

A simple PDF document viewer, in the lines of Evince but without using the Gnome libraries. ePDFView is a free lightweight PDF document viewer using Poppler and GTK+ libraries.

Orion is a pdf, djvu, xps and cbz file viewer for Android devices, based on mupdf and DjVuLibre libraries.

DjVuLibre is an open source (GPL'ed) implementation of DjVu, including viewers, browser plugins, decoders, simple encoders, and utilities.

Standalone viewer for DjVu files. Features include navigating documents, zooming and panning page images, producing and displaying thumbnails, displaying document outlines, searching documents for particular words in the hidden text layer, copying hidden text to the clipboard, saving pages and documents as bundled or indirect multi-page files, and printing page and documents. The viewer can simultaneously display several pages using a side-by-side or a continuous layout.