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2. Coursera - Wikipedia

   en.wikipedia.org/wiki/Coursera

   A free course can be "upgraded" to the paid version of a course, which includes instructor's feedback and grades for the submitted assignments, and (if the student gets a passing grade) a certificate of completion. [57] [60] Other Coursera courses, projects, specializations, etc. cannot be audited—they are only available in paid versions ...

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Proprietary software for viewing and editing PDF documents. pdftk: GNU GPL/Proprietary: command-line tools to manipulate, edit and convert documents; supports filling of PDF forms with FDF/XFDF data. PDF-XChange Viewer: Freeware: Freeware PDF reader, tagger, editor (simple editions) and converter (free for non-commercial uses).

4. List of MOOC providers - Wikipedia

   en.wikipedia.org/wiki/List_of_MOOC_providers

   Free & paid courses English Non-profit 2006 US SWAYAM: Science, Engineering, Humanities, Arts Free (Fee for Exams and certification) English, Hindi Non-profit 2017 India Udacity: IT, Business, Product management, Career Free & paid courses English Commercial 2012 US Udemy: Various Anything from introductory tutorial to professional ...

5. Category:Free PDF software - Wikipedia

   en.wikipedia.org/wiki/Category:Free_PDF_software

   This is a category of articles relating to free software for making or viewing Portable Document Format (PDF) documents. That is, software which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy. Typically, this means software which is distributed with a free software license, and whose source code ...

6. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   Some web apps offer free PDF editing and annotation tools. The Free Software Foundation was "developing a free, high-quality and fully functional set of libraries and programs that implement the PDF file format and associated technologies to the ISO 32000 standard", as one of its high priority projects.

7. Nitro Pro - Wikipedia

   en.wikipedia.org/wiki/Nitro_Pro

   Nitro Software offers a PDF editor, a browser-based application for electronic signatures, and various PDF productivity tools. Subscription services feature cloud-based user management, deployment, and analytics tools. The company also manages several document conversion websites. Nitro Software's desktop products are compatible with Windows ...