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2. OpenStax - Wikipedia

   en.wikipedia.org/wiki/Openstax

   OpenStax (formerly OpenStax College) is a nonprofit educational technology initiative based at Rice University. Since 2012, OpenStax has created peer-reviewed, openly licensed textbooks, which are available in free digital formats and for a low cost in print. Most books are also available in Kindle versions on Amazon.com and in the iBooks Store.

3. Sumatra PDF - Wikipedia

   en.wikipedia.org/wiki/Sumatra_PDF

   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). [3]

4. Open textbook - Wikipedia

   en.wikipedia.org/wiki/Open_textbook

   Open textbook. An open textbook is a textbook licensed under an open license, and made available online to be freely used by students, teachers and members of the public. Many open textbooks are distributed in either print, e-book, or audio formats that may be downloaded or purchased at little or no cost. [1]

5. Best Free PDF Editors of 2023 - AOL

   www.aol.com/best-free-pdf-editors-2023-204004606...

   There are many PDF editors on the market, including the top-rated Adobe Acrobat Standard and Acrobat Pro, which provide capabilities to convert PDFs, edit them, add e-signatures, and protect the ...

6. Open educational resources - Wikipedia

   en.wikipedia.org/wiki/Open_educational_resources

   Open educational resources (OER) [1] are teaching, learning, and research materials intentionally created and licensed to be free for the end user to own, share, and in most cases, modify. [2][3] The term "OER" describes publicly accessible materials and resources for any user to use, re-mix, improve, and redistribute under some licenses. [4]

7. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   PDF Tools allows creation of PDFs from many types of source input (images, scans, etc.). The PDF-XChange print driver allows printing directly to a PDF. A "lite" version of the print driver is free for non-commercial (home and academic) use. PrimoPDF: Proprietary: Yes: Virtual printer, for Microsoft .NET Framework and uses Ghostscript and RedMon.