Sumatra PDF is a free PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) viewer for Windows

Portable - Optimal performance - Multi Format Reader - Ad-free

Multi-platform, fast and packed with features, Okular allows you to read PDF documents, comics and EPub books, browse images, visualize Markdown documents, and much more.

PDF annotation - Lightweight - Customizable shortcuts - Text editing

Free PDF software that enables you to create, annotate, share, and collaborate on PDF documents.

Scan to PDF - Portable - Support for scripting - PDF annotation

Evince (or GNOME Document Viewer) is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS, SyncTex support with gedit, comics books (cbr,cbz,cb7 and cbt) and others. See Supported Document Formats for details.

Portable - PDF annotation - Invert colours - Lightweight

View, sign, collaborate on and annotate PDF files with our free Acrobat Reader software.

PDF annotation - Sync Across Devices - Edit PDF - Document annotations

MuPDF is a highly versatile, customizable PDF and XPS interpreter solution that can be used across a wide range of applications as a PDF renderer, viewer, or toolkit.

Portable - PDF annotation - Lightweight - Vim key mapping

Xodo is the ultimate cross-platform PDF viewer and annotator. Powerful, fast, and optimized for all phones and tablets, Xodo makes it easy to access, edit, mark up, sort, share, sync, manage, sign, and more with even the most complex PDF documents.

Scan to PDF - OCR - PDF annotation - Split and merge PDF files

Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid

Customizable

Preview is a simple and elegant application by Apple for viewing and working with images and PDF documents

Edit PDF - Fill PDF Forms - Image resizing - E-signature

Create, Convert, Review and Edit PDF Documents on Windows, macOS, and Linux

Scan to PDF - OCR - Integrated Search - Combine PDF

zathura is a highly customizable and functional document viewer based on the poppler rendering library and the gtk+ toolkit

Extensible by Plugins/Extensions - Lightweight - Vi keybindings - Keyboard navigation

Nitro Reader offers features and functionality far beyond typical PDF readers, and makes working with PDF easier than ever before

PDF annotation - PDF OCR - Print to PDF - Create PDF files

PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.

PDF annotation - Multiple languages - Edit PDF - Watermark images

Excellent powerful tool to edit PDF, annotate PDF, redact, protect and more. PRO Version includes: Remove default watermark Combine PDF files Lifetime license - Windows Commercial use Priority Support

PDF annotation - Edit PDF - Create PDF files - PDF Redaction

A simple PDF Reader built using Electron and PDF.js

Lightweight - Minimalistic - Electron based

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? STDU Viewer is a document viewer for multiple file formats

Portable - Support for regular expressions - Tabbed interface

qpdfview is a Qt-based tabbed document viewer using the Poppler library for PDF rendering and CUPS for printing

PDF annotation - Lightweight - Edit PDF - Fill PDF Forms

In version 8, Google Chrome introduced a free PDF viewer, installed by default

Google Chrome Extension - Convert PDF to Word document

Atril is a simple multi-page document viewer. Atril is a fork of Evince.

PDF annotation - Night mode/Dark Theme - Support for Javascript