Desktop-Readers

* recommended for this platform

BePDF
Homepage: http://bepdf.sourceforge.net/
Download: http://www.bebits.com/app/1438
icon: http://www.bebits.com/get/icon/416/BePDF.gif

ePDFView
Homepage: http://trac.emma-soft.com/epdfview/
Download Source: http://trac.emma-soft.com/epdfview/wiki/Download
icon: TODO

Evince
Homepage: http://www.gnome.org/projects/evince/
Download: http://live.gnome.org/Evince/Downloads
icon: TODO

Ghostscript
Homepage: http://ghostscript.com/
Download: http://www.ghostscript.com/download/
icon: TODO

gv
Homepage: http://www.gnu.org/software/gv/
Download Source: http://gnu.mirrors.pair.com/gnu/gv/
icon: TODO

KPDF
Homepage: http://kpdf.kde.org/
Download Source: http://kpdf.kde.org/download.php
icon: TODO

MuPDF
Homepage: http://www.mupdf.com/
Download: http://code.google.com/p/mupdf/downloads/list
icon: TODO

Okular
Homepage: http://okular.kde.org/
Download: http://okular.kde.org/download.php
icon: http://okular.kde.org/images/okular.png

Sumatra PDF
Homepage: http://blog.kowalczyk.info/software/sumatrapdf/free-pdf-reader-de.html
Download: http://blog.kowalczyk.info/software/sumatrapdf/download-free-pdf-viewer-de.html
icon: TODO

Vindaloo
Homepage: http://home.gna.org/gsimageapps/
Download: http://download.gna.org/gsimageapps/Vindaloo/
icon: TODO
comment: won't work on intel-mac, no updates since 2005, remove from list?

Xpdf
Homepage: http://www.foolabs.com/xpdf/
Download: http://www.foolabs.com/xpdf/download.html
icon: http://www.foolabs.com/xpdf/center_logo.png

Zathura
Homepage: http://pwmt.org/projects/zathura/
Download: http://pwmt.org/projects/zathura/download/
icon: TODO

FALSE POSITIVES: /* /*Skim
/*Homepage: http://skim-app.sf.net
/*Comment: uses a proprietary OSX-library (pdfKit) for rendering PDF /* */

Mobile

* recommended for this platform

TODO: add more mobile platforms

AlternateReader
Homepage: http://sourceforge.net/projects/alternatedjvu/
Download-latest: http://sourceforge.net/projects/alternatedjvu/files/latest/download?source=files
icon: TODO

APV - Android PDF Viewer
Homepage: http://code.google.com/p/apv/
Download: http://code.google.com/p/apv/downloads/list
F-Droid: http://f-droid.org/repository/browse/?fdfilter=pdf&fdid=cx.hell.android.pdfview
Google-Play: https://play.google.com/store/apps/details?id=cx.hell.android.pdfviewpro
icon: http://lh4.ggpht.com/RIy46czd3S2_zIcShOgNIJeAAVci8jpreliTRlreUhkK2iGT3xe7SqM3Phd1KbDU0g=w124

DroidReader
Homepage: http://code.google.com/p/droidreader/
Download: http://code.google.com/p/droidreader/downloads
F-Droid: not avialable
Google-Play: not available
icon: http://code.google.com/p/droidreader/logo?cct=1290514958

EBookDroid
Homepage: http://code.google.com/p/ebookdroid/
Download: http://code.google.com/p/ebookdroid/downloads
F-Droid: not available, only VuDroid
Google-Play: https://play.google.com/store/apps/details?id=org.ebookdroid
icon: http://code.google.com/p/ebookdroid/logo?cct=1333034048
comment: apparently this supersedes VuDroid, which supersedes pdfDroid and DjvuDroid, so we needn't list those

TODO: add more readers for existing platforms

/* Homepage:
/* Download:
/* F-Droid:
/* GooglePlay:
/* icon: TODO
/* /* FALSE POSITIVES: /* /* VFR-Reader [iOS]
/* Homepage: https://github.com/vfr/Reader<<BR>> /* Comment: uses a proprietary OSX-library (pdfKit) for rendering PDF
/* */

Web-Site plugins & online services

pdf.js
Homepage: http://andreasgal.github.com/pdf.js/
If you offer PDF-files on a web-site you maintain, you can use pdf.js to have them displayed in the browser of your users. If you choose to do so, please inform your users that this is being done with Free Software, and offer them pdf.js for download, so that they receive the same freedoms you received.

psview-interface
Homepage: http://view.samurajdata.se/
If you cannot use any of the other software described here, you can use this service to convert PDF fils to other (standardized) formats. You can also use the software to develop your own conversion service. If you do, please inform your users that this is being done with Free Software, and offer them the source code for download, so that they receive the same freedoms you received.

Browser-Plugins

¹ Although Chrome is mostly Free Software, the PDF-Plugin is not.
TODO: We need a replacement and instructions on how to deactivate builtin

pdf.js
Homepage: http://andreasgal.github.com/pdf.js/
Mozilla-Plugin: https://addons.mozilla.org/de/firefox/addon/pdfjs/

TODO: What about Mozplugger with Evince or Okular? Anything we can recommend?
TODO: What about Sumatra on Windows, it is supposed to have a plugin. Is this true? For which browsers?
TODO: Can we get pdf.js packaged for Chrome and especially Chromium?

TODO: are there more browser plugins

TODO: is there a way to detect if a browser has support for rendering pdf, or not?