PDF.js is a Portable Document Format (PDF) viewer that is built with HTML5. PDF.js is community-driven and supported by Mozilla Labs. Our goal is to create a general-purpose, web standards-based platform for parsing and rendering PDFs.

PDF.js - PDF Reader in JavaScript

PDFedit is a free open source pdf editor and a library for manipulating PDF documents. It includes PDF manipulating library based on xpdf, GUI, set of command line tools and a pdf editor. You can use it to read, change and extract information from a PDF file. It is based on xpdf library.

PDFEdit 

MuPDF is a lightweight PDF, XPS, and E-book viewer. It renders text with metrics and spacing accurate to within fractions of a pixel for the highest fidelity in reproducing the look of a printed page on screen. It supports PDF 1.7 with transparency, encryption, hyperlinks, annotations, searching and more. The viewer is small, fast, yet complete. It supports many document formats, such as PDF, XPS, OpenXPS, CBZ, EPUB, and FictionBook 2. You can annotate PDF documents and fill out forms with the mobile viewers (this feature is coming soon to the desktop viewer as well).

MuPDF - A Lightweight PDF, XPS and E-book viewer

Sioyek is a PDF viewer designed for reading research papers and technical books. It can quickly search and open any file you have previously interacted with using sioyek. It supports document search and navigate to referenced figure or bibliography item. It has also support for Bookmarking pages, Highlighting text and lot more.

Sioyek is a PDF viewer designed for reading research papers and technical books

Sumatra PDF is a free PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows. Sumatra PDF is powerful, small, portable and starts up very fast.

Sumatrapdf - PDF, CHM, XPS, DjVu, CBZ and CBR viewer for Windows

Evince is a document viewer for multiple document formats. The goal of evince is to replace the multiple document viewers that exist on the GNOME Desktop with a single simple application. Evince is specifically designed to support the file following formats: PDF, Postscript, djvu, tiff, dvi, XPS, SyncTex support with gedit, comics books (cbr,cbz,cb7 and cbt).

Evince - Document Viewer

zathura is a highly customizable and functional document viewer based on the girara user interface library and several document libraries.  zathura is capable of exporting images and attachments, opening encrypted documents and printing them. You can search through the document or browse its index or checkout the document meta information.

Zathura - Document Viewer

 Poppler is a PDF rendering library based on the xpdf-3.0 code base. 

Poppler - PDF rendering library

Okular is a universal document viewer based developed by KDE. It combines the excellent functionalities with the versatility of supporting different kind of documents, like PDF, Postscript, DjVu, CHM, XPS, ePub and others.

Okular - Universal Document Viewer by KDE

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