There are several different versions of it, some qualifying as an Open Standard , some certified by ISO and some encumbered by software patents. You might want to promote the versions that are Open Standards, because Open Standards guarantee interoperability, competition and choice.
Read more There are many programs to read and write PDF documents. All of the PDF readers in the following list are Free Software , respecting your basic four freedoms to use, study, share and improve them.
This gives you control over your computer and helps protect your privacy. The document viewer of the Gnome project can display many document formats beside PDF.
Sumatra PDF is powerful, small, portable and starts up very fast. The document viewer of the KDE project displays also postscript, doc, odt and other formats.
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JS is not a stand alone application for viewing pdf, but a plugin available for various web browsers. It may suit you when you come across a lot of pdf files online or in an environment where you cannot or do not want to install a full desktop application. A lightweight postscript and pdf viewer with xaw3d interface.
Successor of ghostview. Other proprietary alternatives to Adobe's PDF reader also exist, but like it, their internal working is a trade secret and these programs do not respect your right to control your own privacy and data.
Note that most Free Operating Systems provide package management systems and do not require you to download any files manually from project pages. You will find instructions on how to install these packages on the website of your distributor.
The download pages referred to will provide source code, should you desire to build the software.