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Website. www .iso .org /standard /75839 .html. Portable Document Format ( PDF ), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.   Based on the PostScript language, each PDF ...
As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed. PagePlus: Proprietary: No
Acrobat Reader Touch is a free PDF document viewer developed and released on December 11, 2012 by Adobe Systems for the Windows Touch user interface. FormsCentral was a web form filling server for users with Windows, macOS, or a web browser and an Adobe ID only. It was discontinued on July 28, 2015 and was replaced by Experience Manager Forms.
Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ).
Foxit PDF Reader (formerly Foxit Reader) is a multilingual freemium PDF ( Portable Document Format) tool that can create, view, edit, digitally sign, and print PDF files.  Foxit Reader is developed by Fuzhou, China-based Foxit Software. Early versions of Foxit Reader were notable for startup performance and small file size. 
PDF was developed to share documents, including text formatting and inline images, among computer users of disparate platforms who may not have access to mutually-compatible application software.  It was created by a research and development team called Camelot,  led by Adobe's co-founder John Warnock.